Question

what is the main difference between meiosis i and meiosis ii?
○ a. crossing over occurs in meiosis i but not meiosis ii
○ b. sister chromatids separate in meiosis i but not meiosis ii
○ c. homologous chromosomes separate in meiosis i but not meiosis ii
○ d. meiosis i produces sperm and meiosis ii produces eggs

Explanation:

• Option a: Crossing - over occurs in prophase I of meiosis I. In meiosis II, there is no crossing - over as it is more similar to mitosis.
• Option b: Sister chromatids separate in meiosis II, not in meiosis I. In meiosis I, homologous chromosomes separate.
• Option c: Homologous chromosomes separate in anaphase I of meiosis I. In meiosis II, sister chromatids separate, and homologous chromosomes do not separate again.
• Option d: Both meiosis I and meiosis II are involved in the production of both sperm (in males) and eggs (in females). The production of sperm and eggs is not a fundamental difference between meiosis I and II.

Answer:

A. Crossing over occurs in meiosis I but not meiosis II, C. Homologous chromosomes separate in meiosis I but not meiosis II