本题目来源于试卷: Continuity and Change D.8 Inheritance，类别为 IB生物学
[单选题]
Neurons of the fruit fly ( 0w kx2rxf)t36pm rq0+w :a.n m/stlhwDrosr i,d; ;bn04e:hd;hxrkqwb/p g8s*qw ophila melanogaster) have 8 chromosomes. How many chromosomes are in a ferdd bgqw,shw r8nk qhx;i ;eb*;4p:/0rtilised oocyte of a fruit fly?
A. 8
B. 4
C. 2
D. 16
参考答案: A
本题详细解析:
At fertilisation, two gametes, which are haploid, fuse together to produce a diploid cell. Gametes of a fruit fly have a haploid number of 4, so fertilisation produces a cell with 8 chromosomes (choice A). Choice B is incorrect because 4 is the haploid number. Choice C is incorrect because fruit fly somatic cells have 8 chromosomes and fertilised egg cells have 8 chromosomes. Choice D is incorrect because 16 is twice the diploid number of fruit flies.
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