Question

When homologous chromosomes cross over, what occurs?

A) Two chromatids get tangled, resulting in one re-sequencing its DNA.
B) Two sister chromatids exchange identical pieces of DNA.
C) Corresponding segments of non-sister chromatids are exchanged.
D) Maternal alleles are "corrected" to be like paternal alleles and vice versa.

Answer 1

Crossing-over occurs during prophase I of meiosis, and it is the exchange of genetic material between non-sister chromatids of homologous chromosomes. This process, also known as recombination, creates unique combinations of genes and increases genetic variation.

Step-by-step explanation:

Crossing-over occurs during prophase I of meiosis, and it is the exchange of genetic material between non-sister chromatids of homologous chromosomes. As homologous chromosomes align, chromatids from each chromosome can cross over and recombine, resulting in the exchange of corresponding segments of genetic material. This process, also known as recombination, creates unique combinations of genes and increases genetic variation.