A student observing cells under a microscope identifies a cell in which homologous chromosomes are aligned at the equator of the cell. Which stage of meiosis is the cell most likely in?

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Question

A student observing cells under a microscope identifies a cell in which homologous chromosomes are aligned at the equator of the cell. Which stage of meiosis is the cell most likely in?

Accepted Answer

Metaphase I — Award 1 mark for metaphase I. During metaphase I, bivalents (pairs of homologous chromosomes) align at the cell equator. B is incorrect because in metaphase II, individual chromosomes (not pairs) align at the equator. C is incorrect because in anaphase I, homologous chromosomes are separating, not aligned. D is incorrect because in prophase I, chromosomes are pairing up but not yet aligned at the equator.

Answer

Metaphase I

Answer

Anaphase I

Answer

Metaphase II

Answer

Prophase I

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