객관식
During which phase of meiosis does crossing over between homologous chromosomes occur?
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9. Mitosis and Meiosis
Meiosis
객관식
In meiosis, how many nuclear divisions occur to produce haploid cells from a diploid precursor cell?
A
Two nuclear divisions (meiosis I and meiosis II)
B
Three nuclear divisions
C
Four nuclear divisions
D
One nuclear division
검증된 단계별 안내1
Understand that meiosis is a special type of cell division that reduces the chromosome number by half, producing haploid cells from a diploid precursor.
Recall that meiosis consists of two main stages: meiosis I and meiosis II, each involving a nuclear division.
In meiosis I, homologous chromosomes separate, reducing the chromosome number from diploid (2n) to haploid (n), but each chromosome still consists of two sister chromatids.
In meiosis II, the sister chromatids separate, similar to mitosis, resulting in four haploid cells with single chromatids.
Therefore, the total number of nuclear divisions in meiosis is two: one in meiosis I and one in meiosis II.
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