Biology 30 – Mitosis And Meiosis Practice Test

During anaphase I, how many chromatids are present per chromosome at each pole?

Four chromatids per chromosome. One chromatid per chromosome. Two chromatids per chromosome; chromosomes remain double-stranded. No chromatids.

Correct Answer:

Two chromatids per chromosome; chromosomes remain double-stranded.

Explanation:

During anaphase I, homologous chromosomes separate, but the sister chromatids of each chromosome remain attached. Because DNA replication has already duplicated each chromosome, it still consists of two identical sister chromatids held together at the centromere. So, at each pole you have chromosomes that are still double-stranded—two chromatids per chromosome. This contrasts with meiosis II (and mitosis), where the sister chromatids finally separate, producing one chromatid per chromosome. Also, meiosis I reduces the chromosome number by separating homologs, not by separating sister chromatids.

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