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Related Questions
A researcher is curious if Bt resistant bollworms are susceptible to an insecticide called DDT. Bollworms susceptible to Bt have genotype RR or Rr, whereas those resistant to Bt have genotype rr. Bollworms susceptible to DDT have genotype tt, whereas bollworms resistant to DDT have genotypes Tt or TT. In an effort to better understand how these two genes are inherited, the researcher crosses an RR tt bollworm with an rr TT bollworm to produce the F1 generation. Then, the researcher crosses the F1 generation to produce an F2 generation. What proportion of the F2 generation is resistant to both Bt and DDT
Answers
Answer:
The correct answer is - 3/16 or 18.75% portion will be resistant to both Bt and DDT.
Explanation:
It is given that bollworms that are susceptible to Bt are represented by either RR or Rr and resistance one are shown by rr genotype and bollworms that are resistant to DDT are represent TT or Tt genotype and susceptible to DDT have tt genotype.
Cross: RR tt with rr TT
Gametes: Rt and rT
F1 cross:
RT
rT RrTt ( susceptible Bt and resistant DDT)
F1 Cross with F1
Gametes: RT, Rt, rT and rt
cross:
RT Rt rT rt
RT RRTT RRTt RrTT RrTt
Rt RRTt RRtt RrTt RrTt
rT RrTT RrTt rrTt rrTt
rt RrTt Rrtt rrTt rrtt
The bold genotypes are the three out of 16 that are resistant to both DDT and Bt.
Non vascular plants are quite commin in the forests along the coast of Norther California but are relatively rare in the ecosystems around Davis in the Central Valley. What aspects of the life cycle of these plants make it difficult for them to reproduce on our area
Answers
Answer:
The Central Valley of northern California is a region where there is little water supply, while nonvascular plants cannot efficiently store water and they have primitive traits that are dependent on water for reproduction.
Explanation:
The Central Valley of northern California is characterized to have little natural precipitation/snowmelt during the dry summer months. In addition, California's climate also has extended periods of drought. On the other hand, non-vascular plants such as mosses and liverworts, are a type of plant that lacks vascular tissues (xylem and phloem), and they also lack true roots, stems, or leaves. These plants cannot efficiently absorb and store water (which fundamental for survival), and thereby the success of these plants in establishing and reproducing in the ecosystems of the Central Valley is limited to their physiological tolerance to desiccation. Moreover, non-vascular plants may also exhibit primitive traits related to their reproductive cycle (e.g., a flagellated sperm) that are dependent on water for reproduction.
How can you apply this approach to the classification of living things?
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Answer:
Living things are classified into groups that start out large and become more specific in a system of classification called taxonomy. Scientists classify living things at eight different levels: domain, kingdom, phylum, class, order, family, genus, and species.
Explanation:
Hope this helps you
Do you think there should be government regulation against known carcinogens? Why or why not? Write a 5-6 sentence paragraph that states your opinion and explains the reasons for it.
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Answer:
Yes,there should be government regulation against known carcinogens;
Because of following reason;
food containing carcinogens cause food poison,cancer and effect our health negatively.it degrades the immunity power of us which makes us weak.if regulations is made people be awared and stop consuming those type of food.people start to consume good diet.Answer:
Yes. I believe that there should be government regulation against known carcinogens. Take food into consideration. Before President Roosevelt passed the first Food and Drug Act, mothers would quite literally feed their children formula that could have heroin in it or any unregulated substance, because companies could do so without any repercussions. Meat factories were dangerous and its no secret that there were a significant amount of rats that fell into the meat. After this act was passed in the United States, factories cleaned up their conditions and food became somewhat safe to eat. This act protected the consumer and made them aware of what they were literally consuming. Why is this different from government regulation against carcinogens? Did you know that bug spray can contain carcinogens? Old fridges? Granite countertops? Weedkiller? Because I did not. Consumers should be aware of the contents of the things they are buying. Corporations SHOULD be held responsible for putting customers in harms way. Government legislation should be passed to protect those who do not know better. Because we should not have to know better. We should already know.
Explanation:
Explain the role of insulin in the homeostatic regulation of blood glucose levels
Answers
Answer:
Insulin helps the cells absorb glucose, reducing blood sugar and providing the cells with glucose for energy. When blood sugar levels are too low, the pancreas releases glucagon. Glucagon instructs the liver to release stored glucose, which causes blood sugar to rise.
Hope this helps!
Will give brainliest
In the atmosphere pool, in which molecule is the carbon found
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10. A molecule that has more
is known as a cation.
O A. protons than electrons
O B. electrons than neutrons
C. electrons than protons
O D. protons than neutrons
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The “great dying,” which saw 96% of all species extinct, was partially caused by(1 point)
an asteroid impact.
lower levels of carbon dioxide in the air.
bacteria producing large amounts of toxic methane.
algae consuming too much oxygen from the ocean.
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The “great dying,” which saw 96% of all species extinct, was partially caused by an asteroid impact. So, the correct option is A.
What do you mean by Species?Species may be defined as a group of organisms that can reproduce with one another in nature and produce fertile offspring.
An asteroid impact threatens the whole biodiversity to a large extent. It leads to the destruction of almost all life forms living on the earth's surface.
Therefore, the “great dying,” which saw 96% of all species extinct, was partially caused by an asteroid impact.
To learn more about Species extinction, refer to the link:
https://brainly.com/question/795397
What causes low pressure? What causes high pressure?
Answers
Answer:
What causes low blood pressure?
Common causes of low blood pressure include a reduced volume of blood, heart disease, and medications. The cause of low blood pressure can be determined with blood tests, radiologic studies, and cardiac testing to look for heart failure and arrhythmias
Explanation:
What triggers high blood pressure?
Common factors that can lead to high blood pressure include: A diet high in salt, fat , and/or cholesterol . Chronic conditions such as kidney and hormone problems, diabetes, and high cholesterol. Family history, especially if your parents or other close relatives have high blood pressure
Which one of these does not add CO2 to the atmosphere?
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Answer:
Planting trees, CARBON CYCLE, and cooking with gas do not add Carbon dioxide to the atmosphere.
Explanation:
The atmosphere naturally breathes or decomposes carbon dioxide rocks, whereas forest fire takes place and volcanoes erupt.
The atmosphere is naturally decomposed. Human activities like fossil fuel and forest burning, and cement production, also add carbon dioxide to the atmosphere.
What type of mutation causes down syndrome? (point, frameshift, deletion, insertion, etc.) -- Why is it categorized as this type of mutation?
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Trisomy 21: About 95% of people with Down syndrome have Trisomy 21. With this type of Down syndrome, each cell in the body has 3 separate copies of chromosome 21 instead of the usual 2 copies. Translocation Down syndrome: This type accounts for a small percentage of people with Down syndrome (about 3%).
cdc
If a star is shown to be 33.11 trillion kilometers away, how many light years would that be?
light years
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Answer:
3.5
Explanation:
Pls help me awnser these questions guys
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Answer:
I cant really see the questions....
Explanation:
Can anyone please help me write my research paper on the use of vaccines please ?
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It is essential simply because for one we need it… to summarize everything that has been stated so far yes I should be taking the vaccine as well as everyone else because I want to take precautions to stay safe… Thank you and have a wonderful day
Another about the actual science behind the ones we use today - dead antigens, and how it activates T cells and memory B cells etc
Perhaps one about the risks and benefits? And go into specific actual case studies?
Help I’ll give you brainilist.
The initial release of sulfur dioxide and nitrogen oxides creates BLANK pollution.
Answers To Fill In BLANK: Air, Ground, Noise, Light, Water.
These compounds chemically react to create acid rain which falls back to Earth, polluting both BLANK. It can even cycle back to the atmosphere through evaporation.
Answers To Fill In BLANK: Ground and Noise, Noise and Light, Light and Water, Water and Ground, Air and Light.
Answers
Answer:
The initial release of sulfur dioxide and nitrogen oxides creates water pollution.
These compounds chemically react to create acid rain which falls back to Earth, polluting both Water and Ground. It can even cycle back to the atmosphere through evaporation.
Which of the following represents an abiotic factor?
O Bacteria
O Protist
O Plants
Wind
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Answer:
Last one. Wind, because it is non-living which is basically what abiotic is.
A particular region is experiencing a viral epidemic. Which of the following would increase the likelihood of the epidemic becoming a pandemic?
A.A vaccine is developed that prevents individuals from being infected
B. Neighboring populations have little to no immunity to the disease.
C.The infection can be spread only by direct contact from one person to another
D.The region is remote and experiences little to no tourism.
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А what
is an opening in Earth's crust that leads to a pool of molten rock
beneath the crust.
O landslide
O earthquake
volcano
flood
Answers
Answer:
volcano flood
Explanation:
it's right I took the test
Which of the following would be an example of positive feedback? thanks!
Select one:
Shivering by the muscles when temperature drops.
The attraction of platelets when a wound occurs.
Sweating due to an increase in body temperature.
The reduction of hormone production during pregnancy.
Answers
Answer:
2
Explanation:
The attraction of platelets when a wound occurs indicates a positive feedback. The correct option is B.
What is feedback mechanism?The feedback mechanism is the body's mechanism for keeping hormone levels within desired limits.
The feedback mechanism is activated by an increase or decrease in hormone levels. The body has two types of feedback mechanisms: positive feedback mechanisms and negative feedback mechanisms.
Positive feedback loops and negative feedback loops are the two types of feedback loops.
Positive feedback increases system output, causing growth or decline. Negative feedback dampens output and helps to keep the system stable around an equilibrium point.
Platelet plug formation is thought to be a positive feedback process because ADP and VWF levels rise as more platelets activate to form the plug.
Thus, the correct option is B.
For more details regarding feedback mechanism, visit:
https://brainly.com/question/15574460
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3 Full sentences,
To what extent can we reverse the destruction of the natural world?
Answers
Answer:
Using too much water from lakes and rivers can affect animals’ habitat. Conserve this resource by taking five minute showers, turning off the faucet when you brush your teeth, and bugging your parents to fix leaky pipes.
Explanation:
PLEASE ANSWER ALL
question 21
An animal that only eats the flesh of another animal is called a
A. producer
B. herbivore
C. carnivore
D. omnivore
______________________
question 22
Which of the following statements is true about matter and energy:
A. matter is not recycled, energy is not recycled
B. matter is recycled, energy is not recycled
C. both matter and energy are recycled
D. neither matter nor energy are recycled
______________________
question 23
On what trophic level would you find organisms that use the suns energy directly to make their own food?
A. 1
B. 2
C. 3
D. 4
_______________________
question 24
Which of the following is an abiotic factor in an ecosystem?
A. bird
B. tree
C. rock
D. deer
______________________
question 25
Mushrooms and other fungi are responsible for breaking down dead organic matter. In the ecosystem, they are called:
A. producers
B. comsumers
C. decomposers
D. scavengers
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22: C. Both matter and energy are recycled (I think)
23: A. 1
24: B. Rock
25: C. Decomposers
An atom with an equal number of electrons and protons has no _____
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An atom with an equal number of electrons and protons has no charge.
Which scientist devised tests that helped confirm that bacteria and other microorganisms cause a variety of diseases?
Robert Koch
Anton van Leeuwenhoek
Louis Pasteur
Alexander Fleming
Answers
Answer:
Alexander fleming
Explanation:
but I am not very clear
g There are three alleles at a gene determining eye color in a population of wild cats, the B allele (brown eyes) is dominant to both the G allele (green eyes) and the Y allele (yellow eyes). The G allele is dominant to the Y allele. In a population of 1000, there are 100 yellow-eyed cats, 400 green-eyed cats, and 500 brown-eyed cats. What is the expected frequency of the Y allele
Answers
Answer:
the expected frequency of the Y allele = recessive allelic frequency = 0.316 ≅ 0.32
Explanation:
Due to technical problems, you will find the complete explanation in the attached files.
12 Grizzly bears are classified in the order Carnivora. Their diet consists of roots,
tubers, berries, nuts, fungi, insects, rodents, and fish. What ecological role best
describes grizzly bears?
What
Earth
What
A carnivores
C herbivores
Accord
B omnivores
D producers
Answers
Answer: the answer is
B: omnivores
Which level of organization involves an organism’s use of the mouth, saliva, teeth, stomach, intestines, liver, and pancreas to break down food?
Select one:
Organ.
Cell.
Organ system.
Tissue.
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Answer:
The organ system
Explanation:
All those things you mentioned are part of the organ system, they work together.
Ángel es un cerdo??
a) Sí
b) Obvio que sí
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c)n op orque si es el el uqe no tiene pecho
HELP ASAP!! 5 MINUTES LEFT!!
What stimulates the release of the enzyme amylase into the pancreatic duct so that it can break down starches?
A. acetylcholine molecules from a nearby neuron
B. the breakdown of glucose in the chloroplast
C. the division of the cell
D. the presence of protein in the stomach
E. a decrease in the volume of the large intestine
Answers
Answer:
B. the breakdown of glucose in the chloroplast
Explanation:
Answer:
B
Explanation:
I Took the test and got a A
Hope this helps:-)
3 reasons why nuclear fusion energy could save the world from climate disaster
Answers
Answer:
-Its hydrogen-like fuel is available in virtually limitless quantities
-it produces no greenhouse gases
- no long-term radioactive waste and carries no risk of meltdown
A cross between a pink 4 o'clock plant and a pink 4 o'clock plant results in a
ratio of 1 Red: 2 Pink: 1 White. What type of inheritance pattern is represented
here?
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Answer and Explanation:
Red four o clocks are h/o/m/o/z/y/g/o/u/s RR.
White four o clocks are h/o/m/o/z/y/g/o/u/s WW.
R is not dominant to W and W is not dominant to R. This means that there is an incomplete dominance (or semi-dominance), where the phenotypes will mix and the Dominant alleles doesn't mask the affect of the Recessive alleles.
Pink four o clocks are h/e/t/e/r/o/z/y/g/o/u/s RW.
#teamtrees #PAW (Plant And Water)
Answer: Incomplete dominance
Explanation:
Pink is the third phenotype. The red allele and the white allele do not mask each other. The third phenotype is between the two traits.