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Answer: in order

1. DNA condenses to form chromosomes

4. each pair of chromosomes line up in the middle of the cell

3. pairs of chromosomes separate

2. A nuclear membrane forms around chromosomes

Stage 1- Prophase

Stage 2- Metaphase

Stage 3- Anaphase

Stage 4- telophase

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Answer:

1. DNA condenses to form chromosomes

4. each pair of chromosomes line up in the middle of the cell

3. pairs of chromosomes separate

2. A nuclear membrane forms around chromosomes

Explanation:

During prophase I, the chromosomes condense and become visible inside the nucleus. Because each chromosome was duplicated during the S phase that occurred just before prophase I, each now consists of two sister chromatids joined at the centromere. This arrangement means that each chromosome has the shape of an X.

Once this chromosomal condensation has occurred, the members of each chromosome pair (called homologous chromosomes, because they are similar in size and contain similar genes), align next to each other. At this point, the two chromosomes in each pair become tightly associated with each other along their lengths in a process called synapsis. Then, while the homologous chromosomes are tightly paired, the members of each pair trade adjacent bits of DNA in a process called crossing over, also known as recombination (Figure 1). This trading of genetic material creates unique chromosomes that contain new combinations of alleles.

At the end of prophase I, the nuclear membrane finally begins to break down. Outside the nucleus, the spindle grows out from centrosomes on each side of the cell. As in mitosis, the microtubules of the spindle are responsible for moving and arranging the chromosomes during division.

A schematic shows two pairs of homologous chromosomes arranged in a vertical formation in the middle of a cell. Two developing mitotic spindles flank the four chromosomes. Long fibers radiating from the mitotic spindles are attached to the centromere of each chromosome.

At the start of metaphase I, microtubules emerge from the spindle and attach to the kinetochore near the centromere of each chromosome. In particular, microtubules from one side of the spindle attach to one of the chromosomes in each homologous pair, while microtubules from the other side of the spindle attach to the other member of each pair. With the aid of these microtubules, the chromosome pairs then line up along the equator of the cell, termed the metaphase plate

A schematic shows each member in a pair of homologous chromosomes separating from its partner and migrating in opposite directions. White spindle fibers attached to the centromeres of each chromosome are responsible for the movement of the chromosomes to opposite poles of the cell.

During anaphase I, the microtubules disassemble and contract; this, in turn, separates the homologous chromosomes such that the two chromosomes in each pair are pulled toward opposite ends of the cell (Figure 3). This separation means that each of the daughter cells that results from meiosis I will have half the number of chromosomes of the original parent cell after interphase. Also, the sister chromatids in each chromosome still remain connected. As a result, each chromosome maintains its X-shaped structure.

A schematic shows two overlapping, circular cells, each with a nucleus and two chromosomes. The cytoplasmic portions of the cells are light grey, and the nuclei are dark grey. The chromosomes in the left-hand cell are mostly green, but the lower regions of the right chromatids are orange. The chromosomes in the right-hand cell are mostly orange, but the lower regions of the left chromatids are green. Both cells have remnants of the mitotic spindle in the cytoplasm.

As the new chromosomes reach the spindle during telophase I, the cytoplasm organizes itself and divides in two. There are now two cells, and each cell contains half the number of chromosomes as the parent cell. In addition, the two daughter cells are not genetically identical to each other because of the recombination that occurred during prophase I

According to the principle of causal determinism, everything that will happen in the future is the consequence of what has happened in the past plus _____.

how does binomal nomenclature work? I need a small answer!!!!!​ no more then 1 sentance! i will give brainliest!!!

According Baron Paul Henri d'Holbach "man's life is a line that nature commands him to describe upon the surface of the earth, without his ever being able to swerve from it, even for an instant. He is born without his own consent; his organization does in nowise depend upon himself; his ideas come to him involuntary..."

What view of free will does this quote best represent?

Which of the following processes occurs during sexual reproduction?
A.
An organism splits in two.
B.
An egg cell and a sperm cell unite.
C.
A fragment regenerates into a new organism.
D.
An identical growth forms and then detaches.

what is number 3 please help me out

PLEASE BE QUICK!! I’M TIMED!!

A font refers to ________.

A) The location where two air masses meet.
B) An air mass that extends across a large area.
C) A large body of air moved by global wind patterns.
D) A place on Earth’s surface affected by uneven heating.

According to traditional materialism, _____ are component mechanisms having complex brains producing various brain states.

What would happen if dogs couldn't hear?

Examples of energy conversion in daily life

Compare and contrast biblical creationists and evolutionists worldviews.

Why do members of Congress involve themselves in casework?



a. It requires legislators to travel to foreign countries to address issues related to American interests and involving themselves in it helps members of Congress gain credibility and respect among their peers and the American electorate.


b. It is work that legislators do in committees to edit or revise the language of a bill, and involving themselves in it helps members of Congress increase the chances of their bills being passed and being turned into laws.


c. It is work that legislators do to help their constituents address a problem, and involving themselves in it helps members of Congress win popular support and observe how effectively the executive branch is handling government programs.


d. It involves criminal cases in which federal laws are broken, and involving themselves in it helps members of Congress better understand what bills to support and what bills to reject.

Suggest any 2 reasons why do we need to respire while sleeping?

Can anyone help I don’t understand

I dont kno what is this because since this is layers of earth its hard for me

Isidro visits the same park every week. The park has lots of different rock formations. How does the rock at the park change from week to week?

What planet is next to the moon

Which state in the United States is most effected by earthquakes due to the location of the San Andreas Fault and two plates slipping past one another at that plate boundary?




Florida

New York

Kansas

California

PLEASE HELP, I WILL GIVE BRAINLIEST, 5 STARS AND ALL THAT STUFF, WRONG ANSWER OR LINK AND I WILL REPORT YOU
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Is this a scientific model? Use complete sentences to explain why or why not.

CELL STRUCTURE CROSSWORD
GRADE 7 BIOLOGY

Can anyone help I’m confuse?

A student left a piece of meat uncovered on a kitchen counter overnight. In the morning, he saw that little organisms were crawling on the meat. He concluded that conditions were right for these organisms to spontaneously come to life on the meat.

Explain why the student's conclusion was wrong.

CELL STRUCTURE CROSSWORD
GRADE 7 BIOLOGY

describe how habitat loss is a threat to biodiversity

describe how pollution is a threat to biodiversity

describe how invasive species are a threat to biodiversity

describe how over-exploitation is a threat to biodiversity

describe how Others ex: epidemics are threats to biodiversity

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All fungi are
Prokaryotic
Eukaryotic
Unicellular
Multicellular

Explain Mendel’s laws in genetic terms, that is, in terms of chromosomes, genes, and alleles.

The oceanic plate is ____ than the continental plate and therefore would be forced under the continental plate when they bump into each other. This is known as a subducting plate.

A. More Dense
B. Less Dense

Several species of wasp kill other organisms to lay their eggs in but are not considered true parasites. Why do you think an organism like this isn't considered a true parasite?

Write an example of how a density-dependent factor can increase a population of birds.

Which of the following is a feature of the electron cloud model of an atom?
A.
Electrons travel in specific orbits around the atom.
B.
The first electron shell holds 8 electrons.
C.
All atoms contain two electron shells.
D.
Electrons travel unpredictably.

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