Crossing-over
A) involves the physical exchange of parts of homologous chromosomes.
B) occurs during mitosis.
C) involves the fusion of gametes to restore the diploid number of chromosomes.
D) occurs in somatic cells.

Question

Quizplus · Accepted Answer

Crossing-over occurs during meiosis, which is the process of cell division that produces gametes (sex cells). During meiosis, homologous chromosomes pair up and can exchange genetic material through crossing-over, which involves the physical exchange of parts of homologous chromosomes. This can result in new combinations of alleles on the chromosomes, increasing genetic diversity in offspring. Mitosis is the process of cell division that occurs in somatic cells (non-sex cells), and gametes are formed by fusion of haploid cells, not fusion of gametes.

Crossing-Over