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]
The diagrams below show a cel e7u,7;4 xk4 t)fci vfz(gdgjqp+ykx :ry-4yrqxz . ;el, with a diploid number of 8, in different stages of m - + r4;zy.xer qxy:pykeiosis. Which row correctly names each stage?
A.
B.
C.
D.
参考答案: B
本题详细解析:
Diagram I is metaphase one, because pairs of homologous chromosomes are lined up at the equator and are attached, by spindle fibers, to only one pole. Diagram II is metaphase II, because there are individual chromosomes, composed of sister chromatids, lined up along the equator of the cell. Diagram III is prophase II because there are no homologous chromosomes, and each individual chromosome is composed of sister chromatids that have not been separated. Diagram IV is prophase I because there are four pairs of homologous chromosomes visible, which have not aligned at the equator and have yet to be separated.
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