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3 years ago

Explain why crossing-over is an important source of genetic variation. written response

Biology

1 answer:

iren2701 [21]3 years ago

3 0

Answer:

When crossing over occurs, alleles are exchanged between homologous chromosomes, leading to new combinations of alleles.

Explanation:

Hope this helps!

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In rabbits, short hair is due to a dominant allele, S, and long hair to its recessive allele, s. Black hair is due to a dominant

Natali5045456 [20]

Answer:

SsBB x SsBB

SsBB x SsBb

Explanation:

SS- short hair

ss - long hair

BB- black hair

bb- white hair

Total the number of offspring produced = 2518+817=3335

Where 2518= short haired, black offspring SSBB or SsBb

817= Longed Hair, black offspring ssBB or ssBb

To get the offspring proportion for short hair black offspring

2518/3335×100 = 75.5%

long-haired, blackoffspring =817/3335×100 = 25%

This gives ratio of 3:1 as against the proposed dihybrid phenotypic ratio of Mendel experiment 9:3:3:1

Now, if you remember a dihybrid cross results in 9:3:3:1 phentoype ratio. That is when both parents are heterozygous for both alleles. So we can rule that out since it doesn't match our 3:1 ratio.

Since all the offspring are black , it means one parent is homozygous dominant for black and the other parent is either homozygous or heterozygous for the black allele.

Since the ratio is 3:1, for the hair length

That leaves us with the short hair. Since the ratio is 3:1, both parents are heterozygous for hair length.

Therefore, the possible parental genotype is

SsBB x SsBB

SsBB x SsBb

4 0

3 years ago

During which process is oxygen gas released into the atmosphere?

qaws [65]

Answer:

photolysis

Explanation:

it happens when the uv radiaiton of sunlight breaks apart the oxygen containg molecules.

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3 years ago

Synopsis: Jenny has been working hard all summer on her tomato garden. Recently, she noticed that insects have been eating her t

likoan [24]

Answer:

This question is asking to match each sentence to the steps involved in the scientific method. The steps based on the order of the sentence are:

1. Formulating hypothesis

2. Testing with an experiment

3. Analysis of results

4. Make observation/Ask a question

5. Conclusion

6. Do background research

Explanation:

The scientific method involves a series of steps that aims at solving a problem or providing an answer to a question about nature. The steps in order are:

- Making an observation/Asking a question

- Do a background research

- Formulate a hypothesis

- Testing hypothesis with an experiment

- Analyze result of experiment

- Draw conclusions

According to this question regarding Jenny, she employs the scientific method to perform an experiment. However, the steps of the scientific method involved in her experiment is disorderly. The matching step of scientific method with each statement is:

1. Jenny states that if she sprays her vegetables with a natural, homemade solution to help fight the bug problem, then her vegetables will still grow to the same size as they would if she used store bought pesticides_FORMULATE A HYPOTHESIS__

2. Jenny sprays one third of her vegetables with store bought pesticides , one third of her vegetables with her homemade solution, and does not spray the remaining third (her control group) __TESTING HYPOTHESIS WITH AN EXPERIMENT___

3. After one week, Jenny compares and tests the differences in her vegetables___ANALYSIS OF RESULTS___

4. Jenny wonders how she can protect her plants from bugs without harming the vegetables___MAKE AN OBSERVATION/ASK A QUESTION__

5. Jenny determines that her homemade solution was just as effective as the store-bought pesticides__DRAW CONCLUSIONS___

6. Jenny goes to the library and looks up different kind of pesticides and their effect on vegetables and also looks up natural remedies to help solve her bug problem__DO A BACKGROUND RESEARCH___

4 0

3 years ago

Damage to which structures may result in a heart murmur?

solong [7]

Damage to heart valves can lead to heart murmur.

Explanation:

Heart murmur refers to the sound of blood flow. The sound of flowing blood in the heart is usually not heard.

The heart murmurs can result due to two reasons that is either a damaged valve or any condition that causes the heart to beat at a faster rate.

The types of damage to the heart valve that may lead to heart murmurs are:

Mitral valve prolapse, Mitral valve or aortic stenosis and Mitral or aortic sclerosis.

Sometimes, the murmurs do not signify a serious condition but under certain condition they may indicate the risk of heart failure.

7 0

3 years ago

What TYPE of nucleic acid is found in the Ebolavirus?

Ilya [14]

Answer:

virion nucleic acid

The virion nucleic acid of Ebola virus consists of a single-stranded RNA with a molecular weight of approximately 4.0 x 10(6).

Explanation:

7 0

3 years ago