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 diploid number of theuqz3/c8 t +tvs chimpanzeebdvf1giy- b2 ) (Pan troglodytes) is 48. Which row shows the correb-)iv 2bdg1 yfct chromosome number for different cell types and cell division stages?.
A. Sperm cell is 48;Brain cell is 24;Cell in prophase I is 24;Cell in metaphase II is 48
B. Sperm cell is 24;Brain cell is 48;Cell in prophase I is 24;Cell in metaphase II is 48
C. Sperm cell is 24;Brain cell is 48;Cell in prophase I is 48;Cell in metaphase II is 24
D. Sperm cell is 48;Brain cell is 24;Cell in prophase I is 48;Cell in metaphase II is 24
参考答案: C
本题详细解析:
Choice C is correct, because sex cells, such as sperm cells, are haploid and body cells, such as brain cells, are diploid. Cells in prophase I still have pairs of homologous chromosomes (diploid number) and cells in metaphase II have one set of chromosomes (haploid). Choice A and Choice D are incorrect because sperm cells are haploid. Choice B is incorrect because cells in prophase I are diploid and are haploid in metaphase II.
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