Question

crossing over occurs during meiotic cell division. in this process, homologous chromosomes pair and exchange parts. what is the significance of crossing over?
it reduces the risk of mutation.
it increases the longevity of a cell.
it introduces genetic variation.
it facilitates quick fertilization.

Explanation:

Cross - over in meiosis involves homologous chromosomes exchanging parts. This shuffles genetic material, leading to new combinations of alleles and thus introducing genetic variation. It has no direct link to reducing mutation risk, increasing cell longevity, or facilitating quick fertilization.

Answer:

It introduces genetic variation.