Question

which of the following does not produce genetic variation in offspring? a) separation of sister chromatids during mitosis b) fertilization of egg with sperm c) random assortment of chromosomes during meiosis d) crossing over during meiosis

Explanation:

To determine which option does not produce genetic variation, we analyze each:

• Option A: Mitosis (sister chromatid separation) produces genetically identical daughter cells (for growth/repair), so no new variation.
• Option B: Fertilization combines unique parental gametes, increasing variation.
• Option C: Random chromosome assortment in meiosis creates new allele combinations.
• Option D: Crossing over in meiosis swaps genetic material, generating variation.

Only mitotic sister chromatid separation (A) does not introduce new genetic variation.

Answer:

A) separation of sister chromatids during mitosis