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 (Drosophila melanogaster) have 8 chromosomes.-xuoa22n205qn 2mut :fwl1i fspaw2 q How .z4yrd j1yn . q9c-opp. x0ewtmany y9w r0qx1c -pedtpy. z.nj .o4chromosomes are in a fertilised 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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