Continuity and Change D.7 Reproduction (id: 5af4c93ae)

本题目来源于试卷: Continuity and Change D.7 Reproduction，类别为 IB生物学

[单选题]
The micrograph shows fmnr*. x.ckxpb+ ;nz7an oocyte after the first mmo18 7jsu g+ w7dker;gez9s1feiotic division. This results in the formation of one large cell and one se +8; od jwg79s uzs1ek1mgr7fmall cell. What is the fate of the large cell?

A. It degenerates and dies.
B. It undergoes mitosis.
C. It secretes the hormone human chorionic gonadotropin (hCG).
D. It becomes a gamete.


参考答案:  D


本题详细解析:

The small cell is the polar body and the large cell is the primary oocyte which will divide by meiosis again and become the gamete. Choice D is correct.

Choice A is incorrect as the small cell (polar body) degenerates and dies, not the large cell. Choice B is incorrect as the large cell divides by meiosis, not mitosis. Choice C is incorrect, as hCG is a hormone that is secreted by the fertilized embryo.

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