Question

How does crossing over add to the genetic diversity of sexually reproducing organisms?

A. It involves segments of two homologous chromosomes trading places.
B. It involves random segregation of the homologous chromosomes to each daughter cell.
C. It involves fertilization of an ovum by any one out of millions of sperms.

Answer 1

Answer;

A. It involves segments of two homologous chromosomes trading places.

Explanation;

-Crossing over is the process of exchange of genetic material or segments between non-sister chromatids of two homologous chromosomes. Crossing over occurs due to the interchange of sections of homologous chromosomes.

-Crossing over occurs between prophase 1 and metaphase 1 and is the process where homologous chromosomes pair up with each other and exchange different segments of genetic material to form recombinant chromosomes.

Answer 2

In this item, we are asked to reason out as to why crossing over add to the genetic diversity of the sexually reproducing organisms. The answer to this question is that it is the exchange of genetic material between homologous chromosomes resulting in recombinant chromosomes. The answer to this item is letter B.