Question

which process most contributes to genetic variation in a population?

○ duplication of chromosomes in asexual reproduction

○ chromosome replication during mitosis

○ cytokinesis during cellular division

○ crossing over during meiosis

Explanation:

1. Duplication of chromosomes in asexual reproduction: Asexual reproduction produces offspring identical to the parent, so this process does not contribute to genetic variation.
2. Chromosome replication during mitosis: Mitosis is a process of cell division that results in two identical daughter cells, so chromosome replication here maintains genetic consistency, not variation.
3. Cytokinesis during cellular division: Cytokinesis is the division of the cytoplasm, which is a part of cell division but does not introduce genetic variation.
4. Crossing over during meiosis: During meiosis, crossing over (the exchange of genetic material between homologous chromosomes) occurs, which shuffles genetic material and is a major source of genetic variation in a population.

Answer:

D. crossing over during meiosis