The crossing over mechanism of genetic variation results from the exchange of gene segments between non sister chromatids. The correct answer is A.
The answer is sympathetic nervous system. Sympathetic nervous system is usually activated during sexual intercourse as a result of fear or anxiety and its activation leads to premature ejaculation in males and lack of lubrication in females.
<h3>Answer:</h3><h2>It is because of different arrangements of nucleotide bases.</h2>
<h3>Explanation:</h3>
There are only five types of nucleotide basis are present in the genetic material which makes up the all the genetic information of the individuals. These nucleotides are named as Adenine, Thymine, Guanine, Cytosine and Uracil. In all the living beings on the earth, these only five nucleotides are present which decides their behavior and functions on the earth. These five bases have features to get any arrangements according to the situation. Their different arrangement at the heredity material makes the difference in all living beings regarding their behavior.
The scientist would probably use the following steps to restore the dogs' eyesight.
>Since normal gene is carried by harmless virus, scientists inject the virus into the eyes of the blind dogs.
<span>> Virus injected contains normal genes which replace the defective ones. This process is called gene therapy.
> After the process, the dogs can now see.
</span>
Answer:
Because they don't have a nucleus which houses DNA and no RNA. These are require to repair cells whenever damage is done. Since these are absent, the cell can only survive 120 days if minimal injuries.
