本题目来源于试卷: Continuity and Change D.4 Cell & Nuclear Division，类别为 IB生物学
[单选题]
When does the random orientation ych) lc0jccg ,6;m ++gaoni-k of homologous chromosr u d6,7q(g.okvlsw7 dome pairs occur?
A. Metaphase I
B. Prophase I
C. Metaphase II
D. Prophase II
参考答案: A
本题详细解析:
Choice A is correct because during metaphase I homologous chromosomes align at the equator and are subject to random orientation. Choice B is incorrect as, during Prophase I, homologous chromosomes condense and crossing over occurs. Choice C is incorrect as, during Metaphase II, chromosomes align on the cell's equator, and there is random orientation of the sister chromatids and not homologous chromosomes. Choice D is incorrect as, during Prophase II, chromosomes align on the cell's equator.
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