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Question
during which part of meiosis (meiosis i or meiosis ii) do the two alleles of a gene separate? during which phase does the separation occur? state your answer as meiosis i or meiosis ii, followed by a comma and the name of the phase (for example, if your answer is meiosis ii and metaphase, enter meiosis ii, metaphase). view available hint(s) submit
The two alleles of a gene (on homologous chromosomes) separate during anaphase I of meiosis I as homologous chromosomes are pulled to opposite poles. For sister chromatids (with identical alleles usually, but if crossing over occurred, they can have different alleles), separation is in anaphase II of meiosis II. But the primary separation of two alleles (from a gene on homologous chromosomes) is in meiosis I, anaphase I. Wait, the question says "the two alleles of a gene separate"—the main separation of alleles (on homologous chromosomes) is during anaphase I of meiosis I. But let's recall: in meiosis I, during anaphase I, homologous chromosomes (each with two sister chromatids, carrying alleles) separate. So the two alleles (on the two homologous chromosomes) separate in anaphase I of meiosis I. Wait, but maybe the question is about when the separation occurs. Wait, the problem says "State your answer as meiosis I or meiosis II followed by a comma and the name of the phase (for example, if your answer is meiosis II and metaphase, enter meiosis II, metaphase)". Wait, maybe I made a mistake. Wait, the separation of homologous chromosomes (carrying alleles) is in anaphase I of meiosis I. But maybe the question is about the separation of sister chromatids? No, sister chromatids have the same allele unless crossing over. Wait, the two alleles of a gene: if the gene is on a homologous chromosome pair, then during meiosis I, anaphase I, the homologous chromosomes separate, so the two alleles (one on each homolog) separate. So the answer should be meiosis I, anaphase. Wait, but the example is meiosis II, metaphase. Wait, maybe the question is about the separation of sister chromatids? No, sister chromatids are identical. Wait, maybe the question is about when the alleles (on sister chromatids, after crossing over) separate? Then it's meiosis II, anaphase. But the standard Mendelian segregation: alleles on homologous chromosomes separate in meiosis I, anaphase I. Wait, the problem's example is meiosis II, metaphase, but that's not when separation occurs. Wait, maybe the question is misphrased, but according to the standard, the separation of alleles (on homologous chromosomes) is in meiosis I, anaphase I. But let's check: in meiosis I, during anaphase I, the homologous chromosomes are pulled apart, so the two alleles (one on each homolog) move to opposite poles. So the answer is meiosis I, anaphase. But the problem says "enter meiosis I or meiosis II followed by a comma and the name of the phase". Wait, maybe the question is about when the separation occurs. Wait, maybe the correct answer is meiosis I, anaphase. But let's confirm: the law of segregation states that alleles separate during gamete formation, which is meiosis. The separation occurs during anaphase I of meiosis I when homologous chromosomes (carrying the two alleles) are separated. So the answer should be meiosis I, anaphase. But the example given is meiosis II, metaphase, which is not a separation phase. Metaphase is when chromosomes align. Anaphase is when they separate. So perhaps the question has a typo, but according to the standard, the answer is meiosis I, anaphase. Wait, but the user's question is to state the answer as meiosis I or II, comma, phase. So I think the correct answer is meiosis I, anaphase. But let me check again. Wait, maybe the question is about the separation of sister chromatids (which would be meiosis II, anaphase), but sister chromatids have the same allele. So maybe the question is about the separation of homologous chromosomes (carrying different all…
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meiosis I, anaphase