Question

how do meiosis i and meiosis ii differ?
select the two answers that are correct.

• meiosis i yields four haploid daughter cells, whereas meiosis ii yields two haploid daughter cells.
• meiosis i yields diploid daughter cells, whereas meiosis ii yields haploid daughter cells.
• meiosis i divides homologous chromosomes, whereas meiosis ii divides sister chromatids.
• meiosis i is preceded by dna replication, whereas meiosis ii is not preceded by replication.
• meiosis i yields egg cells, whereas meiosis ii yields sperm cells.

Explanation:

• Option C: In meiosis I, homologous chromosomes pair and separate. In meiosis II, sister chromatids (which are the result of DNA replication before meiosis I) separate.
• Option D: Before meiosis I, DNA replication occurs (during the S - phase of interphase) to duplicate the genetic material. Before meiosis II, there is no DNA replication.
• Option A: Meiosis I yields two haploid daughter cells, and meiosis II (after meiosis I) yields four haploid daughter cells in total (two from each of the two cells produced in meiosis I).
• Option B: Meiosis I yields haploid daughter cells (because homologous chromosomes separate, reducing the chromosome number by half).
• Option E: Both meiosis I and meiosis II are involved in the production of both egg and sperm cells. The difference in gamete formation (e.g., polar body formation in oogenesis) is not related to the difference between meiosis I and meiosis II in terms of the events described in the question.

Answer:

C. Meiosis I divides homologous chromosomes, whereas meiosis II divides sister chromatids.
D. Meiosis I is preceded by DNA replication, whereas meiosis II is not preceded by replication.