What is the output of the sum of 1001011 and 100011 displayed in hexadecimal?

Answers

Answer 1

Answer:

[tex]1001011_2[/tex]    [tex]+[/tex]   [tex]100011_2[/tex]   [tex]=[/tex]    [tex]6E_{hex}[/tex]

Explanation:

Required

[tex]1001011_2 + 100011_2 = []_{16}[/tex]

First, carry out the addition in binary

[tex]1001011_2[/tex]    [tex]+[/tex]   [tex]100011_2[/tex]   [tex]=[/tex]    [tex]1101110_2[/tex]

The step is as follows (start adding from right to left):

[tex]1 + 1 = 10[/tex] --- Write 0 carry 1

[tex]1 + 1 + 1(carry) = 11[/tex] ---- Write 1 carry 1

[tex]0 + 0 + 1(carry) = 1[/tex] ---- Write 1

[tex]1 + 0 = 1[/tex] --- Write 1

[tex]0 + 0 = 0[/tex] ---- Write 0

[tex]0 + 0 = 0[/tex] ---- Write 0

[tex]1 + 1 = 10[/tex] --- Write 0 carry 1

No other number to add ; So, write 1 (the last carry)

So, we have:

[tex]1001011_2[/tex]    [tex]+[/tex]   [tex]100011_2[/tex]   [tex]=[/tex]    [tex]1101110_2[/tex]

Next, convert [tex]1101110_2[/tex] to base 10 using product rule

[tex]1101110_2 = 1 * 2^6 +1 * 2^5 + 0 * 2^4 + 1 * 2^3 + 1 * 2^2 + 1 * 2^1 + 0 * 2^0[/tex]

[tex]1101110_2 = 64 +32 + 0 + 8 + 4 + 2 + 0[/tex]

[tex]1101110_2 = 110_{10}[/tex]

Lastly, convert [tex]110_{10}[/tex] to hexadecimal using division and remainder rule

[tex]110/16 \to 6\ R\ 14[/tex]

[tex]6/16 \to 0\ R\ 6[/tex]

Write the remainder from bottom to top;

[tex]110_{10} = 6(14)_{hex}[/tex]

In hexadecimal

[tex]14 \to E[/tex]

So, we have:

[tex]110_{10} = 6E_{hex}[/tex]

Hence:

[tex]1001011_2[/tex]    [tex]+[/tex]   [tex]100011_2[/tex]   [tex]=[/tex]    [tex]6E_{hex}[/tex]


Related Questions

Is 10 teraflops good? How much does the best PC in the world have?​

Answers

Yeah it’s pretty good. The system, built by Fujitsu for Japan's RIKEN Center for Computational Science, posted a maximum sustained performance level of 442,010 teraflops per second on the Linpack benchmark.

Select the correct answer.
Dina created a database related to essential oils and their uses. For every oil, she wants to enter a unique code number. Which data type would be suitable for entering this data?

A.
Boolean
B.
autonumber
C.
BLOb
D.
memo
E.
null

Answers

Answer:

Autonumber

This is because Autonumber is the only option out of the four that accepts random unique code numbers

Feel free to mark as brainliest :D

python

how do I fix this error I am getting

code:

from tkinter import *
expression = ""

def press(num):
global expression
expression = expression + str(num)
equation.set(expression)

def equalpress():
try:
global expression
total = str(eval(expression))
equation.set(total)
expression = ""

except:
equation.set(" error ")
expression = ""

def clear():
global expression
expression = ""
equation.set("")


equation.set("")

if __name__ == "__main__":
gui = Tk()



gui.geometry("270x150")

equation = StringVar()

expression_field = Entry(gui, textvariable=equation)

expression_field.grid(columnspan=4, ipadx=70)


buttonl = Button(gui, text=' 1', fg='black', bg='white',command=lambda: press(1), height=l, width=7)
buttonl.grid(row=2, column=0)

button2 = Button(gui, text=' 2', fg='black', bg='white',command=lambda: press(2), height=l, width=7)
button2.grid(row=2, column=1)

button3 = Button(gui, text=' 3', fg='black', bg='white',command=lambda: press(2), height=l, width=7)
button3.grid(row=2, column=2)

button4 = Button(gui, text=' 4', fg='black', bg='white',command=lambda: press(2), height=l, width=7)
button4.grid(row=3, column=0)
button5 = Button(gui, text=' 5', fg='black', bg='white',command=lambda: press(2), height=l, width=7)
button5.grid(row=3, column=1)
button6 = Button(gui, text=' 6', fg='black', bg='white',command=lambda: press(2), height=l, width=7)
button6.grid(row=3, column=2)
button7 = Button(gui, text=' 7', fg='black', bg='white',command=lambda: press(2), height=l, width=7)
button7.grid(row=4, column=0)
button8 = Button(gui, text=' 8', fg='black', bg='white',command=lambda: press(2), height=l, width=7)
button8.grid(row=4, column=1)
button9 = Button(gui, text=' 9', fg='black', bg='white',command=lambda: press(2), height=l, width=7)
button9.grid(row=4, column=2)
button0 = Button(gui, text=' 0', fg='black', bg='white',command=lambda: press(2), height=l, width=7)
button0.grid(row=5, column=0)


Add = Button(gui, text=' +', fg='black', bg='white',command=lambda: press("+"), height=l, width=7)
Add.grid(row=2, column=3)

Sub = Button(gui, text=' -', fg='black', bg='white',command=lambda: press(2), height=l, width=7)
Sub.grid(row=3, column=3)

Div = Button(gui, text=' /', fg='black', bg='white',command=lambda: press("/"), height=l, width=7)
Div.grid(row=5, column=3)

Mul = Button(gui, text=' *', fg='black', bg='white',command=lambda: press("*"), height=l, width=7)
Mul.grid(row=4, column=3)

Equal = Button(gui, text=' =', fg='black', bg='white',command=equalpress, height=l, width=7)
Equal.grid(row=5, column=2)

Clear = Button(gui, text=' Clear', fg='black', bg='white',command=clear, height=l, width=7)
Clear.grid(row=5, column=1)

Decimal = Button(gui, text=' .', fg='black', bg='white',command=lambda: press("."), height=l, width=7)
buttonl.grid(row=6, column=0)

gui.mainloop()

Answers

Answer:

from tkinter import *

expression = ""

def press(num):

global expression

expression = expression + str(num)

equation.set(expression)

def equalpress():

try:

 global expression

 total = str(eval(expression))

 equation.set(total)

 expression = ""

except:

 equation.set(" error ")

 expression = ""

def clear():

global expression

expression = ""

equation.set("")

if __name__ == "__main__":

gui = Tk()

 

equation = StringVar(gui, "")

equation.set("")

gui.geometry("270x150")

expression_field = Entry(gui, textvariable=equation)

expression_field.grid(columnspan=4, ipadx=70)

buttonl = Button(gui, text=' 1', fg='black', bg='white',command=lambda: press(1), height=1, width=7)

buttonl.grid(row=2, column=0)

button2 = Button(gui, text=' 2', fg='black', bg='white',command=lambda: press(2), height=1, width=7)

button2.grid(row=2, column=1)

button3 = Button(gui, text=' 3', fg='black', bg='white',command=lambda: press(3), height=1, width=7)

button3.grid(row=2, column=2)

button4 = Button(gui, text=' 4', fg='black', bg='white',command=lambda: press(4), height=1, width=7)

button4.grid(row=3, column=0)

button5 = Button(gui, text=' 5', fg='black', bg='white',command=lambda: press(5), height=1, width=7)

button5.grid(row=3, column=1)

button6 = Button(gui, text=' 6', fg='black', bg='white',command=lambda: press(6), height=1, width=7)

button6.grid(row=3, column=2)

button7 = Button(gui, text=' 7', fg='black', bg='white',command=lambda: press(7), height=1, width=7)

button7.grid(row=4, column=0)

button8 = Button(gui, text=' 8', fg='black', bg='white',command=lambda: press(8), height=1, width=7)

button8.grid(row=4, column=1)

button9 = Button(gui, text=' 9', fg='black', bg='white',command=lambda: press(9), height=1, width=7)

button9.grid(row=4, column=2)

button0 = Button(gui, text=' 0', fg='black', bg='white',command=lambda: press(2), height=1, width=7)

button0.grid(row=5, column=0)

Add = Button(gui, text=' +', fg='black', bg='white',command=lambda: press("+"), height=1, width=7)

Add.grid(row=2, column=3)

Sub = Button(gui, text=' -', fg='black', bg='white',command=lambda: press("-"), height=1, width=7)

Sub.grid(row=3, column=3)

Div = Button(gui, text=' /', fg='black', bg='white',command=lambda: press("/"), height=1, width=7)

Div.grid(row=5, column=3)

Mul = Button(gui, text=' *', fg='black', bg='white',command=lambda: press("*"), height=1, width=7)

Mul.grid(row=4, column=3)

Equal = Button(gui, text=' =', fg='black', bg='white',command=equalpress, height=1, width=7)

Equal.grid(row=5, column=2)

Clear = Button(gui, text=' Clear', fg='black', bg='white',command=clear, height=1, width=7)

Clear.grid(row=5, column=1)

Decimal = Button(gui, text=' .', fg='black', bg='white',command=lambda: press("."), height=1, width=7)

Decimal.grid(row=6, column=0)

gui.mainloop()

Explanation:

I fixed several other typos. Your calculator works like a charm!

What is Sleep mode? Check all of the boxes that apply.

It is a power-saving mode for a computer.

It puts your work and computer settings in memory while using little power.

It is a power-saving mode designed for laptops.

It is the same thing as Hibernate mode.
The supreme court's ruling in Marbury v. Madison was important because it

Answers

It is a power-saving mode for a computer.

It is a power-saving mode designed for laptops.

The ________ sort usually performs fewer exchanges than the ________ sort. Group of answer choices bubble, selection binary, linear selection, bubble ANSI, ASCII None of these

Answers

Answer:

Answer is C

100% guaranteed.

define micro computer​

Answers

A microcomputer is a complete computer on a small scale, designed for use by one person at a time. An antiquated term, a microcomputer is now primarily called a personal computer (PC), or a device based on a single-chip microprocessor. Common microcomputers include laptops and desktops.

list the three sources of naturally occurring materials​

Answers

Answer:

Flint

granite

sandstone

1. __ and ___ were used in first generation computers

Answers

Answer:

Explanation:

vacuum tubes  and punched cards were used in first generation computers.

I needed help with this answer thanks for your help.

pls help me pass my finals!!​

Answers

Answer:

(a): power(2&-2)

The code is as follows:

power = 2**-2

print(power)

(b): Largest and smallest in a list

The code is as follows:

num = [33,6,11,100,456,109,-4,366]

smallest= min(num)

largest= max(num)

print(smallest)

print(largest)

(c): Loop in Python

(i) Loop are instructions that are repeated until a certain condition is met;

(ii) For loop, in python are used to iterate over a sequence or through a certain range;

The syntax is:

for loop_element in range(iterating_range):

The following is an illustration of for loop that iterates 5 times

for i in range(5):

Explanation:

(a): power(2&-2)

The ** is used to calculate power.

So, 2**-2 represents 2 raise to power -2

power = 2**-2

This prints the calculated power

print(power)

(b): Largest and smallest in a list

This initializes the list

num = [33,6,11,100,456,109,-4,366]

This calculates the smallest using min() function

smallest= min(num)

This calculates the largest using max() function

largest= max(num)

This prints the smallest and the largest

print(smallest)

print(largest)

(c): See answer section

A user calls and complains that she cannot access important company files from her personal device. You confirm that Intune policies are properly set up and assigned to her. What could be the issue that is blocking her from accessing the files

Answers

Answer:

A user calls and complains that she cannot access important company files from her personal device. You confirm that Intune policies are properly set up and assigned to her. What could be the issue that is blocking her from accessing the files? The user's device is rooted or jailbroken.

compare shopping centre and open -air market​

Answers

Answer:

The similarities between a shopping center and an open-air market are;

1. Goods are bought and sold in both a shopping center and an open-air market

2. The stores within the location have different owners

3. Buyers can move between stores for transactions

The differences between a shopping center and an open-air market are;

1) The shopping center is usually roofed, while an open-air market is usually located outdoors

2) The stores in a shopping center more often have a checkout point, while stores in an open-air market rarely make use of a checkout

3) Items found with a defect after purchase can usually be returned for a replacement in a shopping center, while it is necessary to check an item well when buying from an open-air market as returning such items is usually difficult

Explanation:

A shopping center is a complex or area that have several shop groups built together which can all be located under a roof

Professional offices, restaurants, banks, theaters, and pharmacy's  can also be located in a shopping center

Open-air market is a place in the public used for the sale of food and merchandise

Which tab on the Ribbon contains the command to print a publication?

File

Home

Insert

Page Design

Answers

Answer:

File

Explanation:

Click on the File ribbon and find the print option.

Answer:

File is your answer =)

Explanation:

what is a iteration in program code?​

Answers

Answer:

it's when the code keeps repeating e.g while loop

Explanation:

what is file management?can please help me​

Answers

is the process of administering a system that correctly handles digital data. also i think it improves the overall function of a business workflow. but this could be totally wrong.
File Management includes common operations performed on files or groups of files, include creating, opening, renaming, moving or copying, deleting and searching for files, as well as modifying file attributes, properties and file permissions

A(n) ________ CPU has two processing paths, allowing it to process more than one instruction at a time. Group of answer choices dual-core bimodal all-in-one dual-mode Flag question: Question 79 Question 791 pts ________ is concerned with the design and arrangement of machines and furniture to avoid uncomfortable or unsafe experiences. Group of answer choices Repetitive strain prevention Ergonomics Positioning Occupational safety

Answers

Answer:

A dual CPU has two processing paths, allowing it to process more than one instruction at a time.

Ergonomics is concerned with the design and arrangement of machines and furniture to avoid uncomfortable or unsafe experiences.

If you misspell a word in your Java program it may be true that I. the program will not compile II. the program may compile, but not run III. the program may compile and run but still have a logic error

Answers

Answer:

option I

Explanation:

If you misspell a word in your Java program it may be true that the program will not compile

What are some signs that could help you determine that a date and time was inserted as a special object instead of
typed as normal text? Check all that apply.

Answers

Answer:

i) It is difficult to put the mouse pointer's insertion point in the text

ii) A gray border appear around the time and date when you point to it

Explanation:

When the date and time is pointed to or hovered using the mouse pointer, we have, that the background of the text changes to a grey border around the text when the date and time is inserted as a special object using the insert date and time button on the insert menu in the word processing application

The mouse pointer behaves different when working with some applications, and it could be difficult to place the insertion point of the mouse pointer in the  text

Therefore, the correct options are;

It is difficult to put the mouse pointer's insertion point in the text and

A gray border appear around the time and date when you point to it.

For a processor with primary and secondary caches, an instruction cache miss rate of 1%, a data cache miss rate of 5%, a instruction mix of 40% data accesses, a primary to secondary cache miss penalty of 10 cycles and a secondary cache to main memory miss penalty of 200 cycles and a secondary miss rate of 0.2%, what will be the contribution to total CPI from the cache misses (in decimal)

Answers

Answer:

The answer is "0.306".

Explanation:

The Primary to Secondary Memory Instruction miss cycle

[tex]= I \times 0.01 \times 10 = 0.1 I[/tex]

Data miss cycles[tex]= I \times 0.05 \times 10 \times 0.40 = 0.2 I[/tex]  

The Secondary to main Memory Instruction miss cycle[tex]= I \times 0.01 \times 200 \times 0.0002 = 0.004 I[/tex]

Data miss cycles[tex]= I \times 0.05 \times 200 \times 0.0002 = 0.002 I[/tex]

Total memory stall cycle [tex]= ( 0.1 + 0.2 + 0.004 + 0.002 ) I =0.306 I[/tex]

what is the behavior of an element with static positioning in regard to the page layout?

Answers

Answer:

The element is positioned according to the normal flow of the document.

The top, right, bottom, left, and z-index properties have no effect. This is the default value.

The behavior of an element with static positioning in regard to the page layout is that it implies that one put the element in its original position in the aspect of document flow.

What does Static positioning implies?

Static positioning is known to be the normal way that all element have or gets. It implies that one should "put the element into its original place in the document flow as there is nothing special that one needs to see here."

Hence,  the behavior of an element with static positioning is known to be the same and thus If a person do save and refresh, there will be no changes except when there is an updated background color.

Learn more about page layout from

https://brainly.com/question/988590

The storage device which is not usually used as secondary storage is 1 point a) Semiconductor Memory b) Magnetic Disks c) Magnetic Drums d) Magnetic Tapes

Answers

Answer:

a) Semiconductor Memory

Explanation:

A primary storage device is a medium that holds memory for short periods of time while a computer is running

Semiconductor devices are preferred as primary memory.

ROM, PROM, EPROM, EEPROM, SRAM, DRAM are semiconductor (primary) memories.

list = [1,2,3,'a','b','c'] ... write a code to output b * (python)

Answers

Answer:

please tell me if you find the answer i have the same q for my IT med term

Answer:

print(list[4])

Explanation:

Complete breakdown:

The command 'print' shows what command is displayed on the screen

The 'list' shows that Python should print something inside a list

The '4' is the index number of list. Index numbers start from 0 so

'1' - 0

'2'- 1

'3' - 2

'a' - 3

'b' - 4

'c' - 5

3. The art or technique of decorating wood or leather by burning a design on the surface
with a heated metallic point.
A. Pyrography
C. Wood Turning
B. Gilding
D. Hand Carving
4. Combines several techniques that involve inserting decorative pieces into a base
object to incorporate new designs on the original products.
A. Flocking Technique
C. Inlying
B.
Hand Carving
D. Gilding
5. Lines the interior of drawers and boxes with a soft velvety finish
A. Flocking Technique
C. Inlying
B. Hand Carving
D. Gilding
6. It is used to color wood to give an illusion of texture. This may come in two varieties.
A. Staining
C. Pigment-based
B. Dye-based
D. Inlaying
7. Stain will color small pores of the wood
A. Pigment-based
B. Dye-based
C. Flocking Technique
D. Painting
8. Stain will color large pores of the wood
A. Pigment-based
B. Dye-based
C. Flocking Technique
D. Painting
9. Decorative technique in which powder is applied on wood or other materials to give a
thin coating of gold from.
A. Inlaying
C. Gilding
B. Staining
D. Wood Carving
10. The simplest way of decorating wood since there are a variety of colors that you can choose from.
One may also add a lacquer finish to make, it shiny and glossy,
A. Flocking Technique
B. Staining
C. Gilding
D. Painting


due tomorrow pls help I'll make brainliest I promise unrelated answer will get reported​

Answers

Answer:

The answer of number three is pyrography.

Dana frequently joins people in online discussion boards and forums. Which of her habits should she change to maintain proper netiquette?

Answers

Answer:

The correct option is a. correcting others’ spelling and grammar.

Explanation:

Note: This question is not complete as the options are not included. The complete question with the options is therefore provided before answering the question as follows:

Dana frequently joins people in online discussion boards and forums. Which of her habits should she change to maintain proper netiquette?

a. correcting others’ spelling and grammar

b. using a conversational tone

c . breaking large comments into readable paragraphs

d. typing whole sentences with capital letters

The explanation of the answer is now given as follows:

Grammar lessons should not be given in a casual conversation unless the person is a language teacher or has been specifically asked to assist. This indicates that correcting others' spelling and grammar in a normal conversation is often considered impolite. It's simply not polite and a sign of lack of etiquette to criticize the actions of other people when you have not been specifically appointed or when you are not in a position to do so.

Therefore, the correct option is a. correcting others’ spelling and grammar.

in school there are 1800 boys and 1200 girls in an exam only 32% of the boys passed and 50% of the girls passed. find the percentage of the total who did not pass. someone pls help me with this you could send it to me by tomorrow pls do it step by step so I can get it thank you​

Answers

Wow same question!!! Nice

Which of the following devices might be used to transmit electronic mail? *
1 point
(A) Printer
(B) Monitor
(C) Fax machine
(D) Smartphone​

Answers

I believe it is smartphone because a printer prints, a monitor displays information from a computer(does not control it) and a fax machine well faxs stuff so it would only be smart phone

If the system has a mechanical advantage of 5 and the load of 350N.What effort is needed to lift the weight? Provide your answer in newtons​

Answers

Answer:

Effort = 70 N

Explanation:

A machine is a device that can be used to overcome a load by the application of a minimal effort. For a practical machine, mechanical advantage (MA) is the ratio of the load (L) overcome to the effort (E) applied.

i.e MA = [tex]\frac{Load}{Effort}[/tex]

In the given question, MA = 5 and the load = 350 N. So that;

5 = [tex]\frac{350}{E}[/tex]

E = [tex]\frac{350}{5}[/tex]

  = 70

The effort applied to the machine is 70 N.

to calculate perimeter of a rectangle​

Answers

a+b+c+d= perimeter of a rectangle

Answer:

A+B+D+C

Explanation:

Just add all the sides together....

Roger wants to give semantic meaning to the contact information, which is at the bottom of the web page. To do this he will use a footer element as a ______ of the contact information.

Answers

Answer:

Parent

Explanation:

HTML is an acronym for hypertext markup language and it is a standard programming language which is used for designing, developing and creating web pages.

Generally, all HTML documents are divided into two (2) main parts; body and head. The head contains information such as version of HTML, title of a page, metadata, link to custom favicons and CSS etc. The body of a HTML document contains the contents or informations that a web page displays.

In this scenario, Roger wants to give semantic meaning (an element conveying informations about the type of content contained within an opening and closing tag) to a contact information placed at the bottom of a webpage. Thus, in order to do this, he should use a footer element as a parent of the contact information and as such all instance variables that have been used or declared in the footer class (superclass) would be present in its contact information (subclass object).

plants absorb water through root hairs.How do you think this water is used by the plants?​

Answers

Plants absorb water from the soil by osmosis. They absorb mineral ions by active transport, against the concentration gradient. Root hair cells are adapted for taking up water and mineral ions by having a large surface area to increase the rate of absorption.

The Visual Basic workspace contains several worksheets. What window does the user use when developing a project?
A)Toolbox
B)Solution Window
C)Properties Window
D)Form Designer Window​

Answers

A) Toolbox i think it is correct i’m not sure tho sorry if it’s incorrect
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At the start of the day, Megan has the following items for sale:60 Sandwiches 2.4040 Baguettes a 2.7025 Jacket potatoes 3.25She sells all the jacket potatoes, 65% of the sandwiches and 85% of thebaguettes.What is the total value of her sales that day? -13 = 5 + ahelp ME I NEED THE ANSWER ASAP Find the value of x that makes m parallel n . List one chemical form, one barrier formand one behavioral form of contraception The first time Connor goes to the beach, there is litter on the beach, the water is cold, and he is frightened by the large waves. Connor forms a negative attitude about the beach through: 35 points In about 150 words, discuss the purpose for including references to the affair between Abigail and Proctor in The Crucible. Write about going back to school after summer vacation. What is the answer to the equation 3 1/5 +n=9? Many African Americans became involved in politics during Reconstruction byA) participating in constitutional conventions.B) registering to vote as Democrats.C) moving to Northern cities to register voters.D) starting their own political parties in the South. NEED HELP ASAP!!!.....Which is not true about the ionic compound sodium chloride (NaCl)? A.)it was formed when electrons were shared B.)it is electrically neutral C.)it has properties different from the atoms from which it is formed D.)it is a white crystalline solid Read the excerpt from Act III, scene i of Romeo and Juliet.Mercutio: Thou! why, thou wilt quarrel with a man that hath a hair more or a hair less in his beard than thou hast. Thou wilt quarrel with a man for cracking nuts, having no other reason but because thou hast hazel eyes. What eye, but such an eye, would spy out such a quarrel? Thy head is as full of quarrels as an egg is full of meat, and yet thy head hath been beaten as addle as an egg for quarrelling. Thou hast quarrelled with a man for coughing in the street, because he hath wakened thy dog that hath lain asleep in the sun. Didst thou not fall out with a tailor for wearing his new doublet before Easter? with another, for tying his new shoes with old riband? and yet thou wilt tutor me from quarrelling!Benvolio: An I were so apt to quarrel as thou art, any man should buy the fee-simple of my life for an hour and a quarter.Mercutio: The fee-simple! O simple!Benvolio: By my head, here come the Capulets.Why does Shakespeare include this comic speech by Mercutio?to explain Benvolios strange behaviorto question the established laws of Veronato mock the reasons for quarrels and feudsto illustrate the close friendship between the men Please help with this pls. 14. You neverto amaze me!OceaseO ampleinstigateemanate Find the slope of a line that goes through the two points (-1, 1) and (-3, -7). how many puppies were rescued 12x+3= Which leader was most responsible for the spread of communism in China? Which factor contributes the most to the process of water erosion?A) evaporationB) gravityC) pressureD) temperatureHELP Which of the following lines is parallel to the line that passes through (-1, -3) and (5,0)? Graph the function.f(x)=4(3/2)^x definicion de cromatidas