Question

There is a picture attached.

What is the genetic benefit of the process below?
A. It creates new combinations of genes on a chromosome and leads to variation.
B. It increases the likelihood that an organism will survive in a new environment.
C. It results in the conservation of parental genes to offspring.
D. There is no benefit; it is often a disastrous event.

Answer 1

A. It creates new combinations of genes on a chromosome and leads to variation

Answer 2

A. It creates new combinations of genes on a chromosome and leads to variation.

Step-by-step explanation:

The image above shows the occurrence of the genetic process known as "crossing-over". During this process, the chromatids that are nearby exchange pieces among themselves, making possible the emergence of new types of gametes, which are called recombinant gametes, as you can see in the image.

Descendants generated from recombinant gametes are also called recombinant descendants. Therefore, even for double-heterozygous individuals that have genes located on the same chromosome, there is the possibility of formation of four types of gametes. However, as the occurrence of crossing-over is not the rule, the proportion of these gametes and also of descendants will not be the same.

The advantage of crossing over is that it combines new genes on a chromosome and leads to variation.