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提问人：网友wind110 发布时间：2022-01-07

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Concerning maturation of the female gamete（oogenesis),when do the oogonia enter meiosis I and undergo DNA replication to form primary oocytes？

A、During fetal life

B、At birth

C、At pubery

D、With each ovarian cycle

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第8题

When does a secondary oocyte complete its second meiotic division to become a mature ovum?

A、At ovulation

B、Before ovulation

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D、At puberty

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How soon after fertilization occurs within the uterine tube does the blastocyst begin implantation?

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B、By day 1

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Where does the blastocyst normally implant?

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B、Basal layer of the endometrium

C、Myometrium

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