Multiple Choice
Before meiosis can begin, what key event must occur to ensure each gamete can receive a complete set of genetic information?
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9. Mitosis and Meiosis
Meiosis
Multiple Choice
What is accomplished during anaphase I of meiosis?
A
Sister chromatids separate and move to opposite poles.
B
Crossing over occurs between non-sister chromatids, producing recombinant chromosomes.
C
Homologous chromosomes separate and move to opposite poles, reducing the chromosome number from diploid to haploid at each pole.
D
The nuclear envelope reforms around each set of chromosomes, completing cell division.
Verified step by step guidance1
Recall that meiosis consists of two sequential divisions: meiosis I and meiosis II, each with distinct events.
Understand that during anaphase I, the key event is the separation of homologous chromosomes, not sister chromatids.
Recognize that homologous chromosomes are pairs of chromosomes, one from each parent, that pair up during prophase I and align at the metaphase plate during metaphase I.
During anaphase I, these homologous pairs are pulled apart by spindle fibers and move to opposite poles, which reduces the chromosome number from diploid (2n) to haploid (n) in each daughter cell.
Note that sister chromatids remain attached during anaphase I and only separate later during anaphase II, and that crossing over occurs earlier during prophase I, not anaphase I.
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