Multiple Choice
In a typical meiotic cycle leading to the formation of gametes, how many times does interphase occur (including the one S phase for DNA replication) before meiosis I and meiosis II are completed?
9. Mitosis and Meiosis
Meiosis
Multiple Choice
During anaphase II of meiosis II, what separates and moves toward opposite poles of the cell?
A
Sister chromatids of each chromosome
B
Homologous chromosomes (tetrads)
C
Pairs of sister chromatids remain together while whole chromosomes move to opposite poles
D
Crossing-over products (chiasmata) separate as the synaptonemal complex disassembles
Verified step by step guidance1
Recall the stages of meiosis II, focusing on anaphase II, which is analogous to anaphase in mitosis but occurs in haploid cells.
Understand that during anaphase II, the key event is the separation of sister chromatids, which were previously held together at the centromere.
Recognize that homologous chromosomes separate earlier, during anaphase I, so they are not the structures moving apart in anaphase II.
Note that crossing-over products (chiasmata) are resolved during prophase I and metaphase I, not during anaphase II.
Conclude that the structures moving toward opposite poles during anaphase II are the sister chromatids of each chromosome, now considered individual chromosomes.
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