Scelta multipla
Why are human gametes haploid instead of diploid?
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9. Mitosis and Meiosis
Development of Animal Gametes
Scelta multipla
In human females, at what point is meiosis II completed?
A
At puberty, when primary oocytes first resume meiosis I
B
At fertilization, after sperm entry triggers completion of meiosis II in the secondary oocyte
C
At ovulation, when the secondary oocyte is released from the ovary
D
Before birth, during fetal development when primary oocytes are formed
Guida verificata passo dopo passo1
Understand the stages of meiosis in human female gametogenesis: meiosis I and meiosis II.
Recall that primary oocytes begin meiosis I during fetal development but arrest at prophase I until puberty.
Recognize that at puberty, meiosis I resumes and completes, producing a secondary oocyte and the first polar body.
Know that the secondary oocyte immediately begins meiosis II but arrests at metaphase II and is ovulated in this arrested state.
Identify that meiosis II is only completed upon fertilization, when sperm entry triggers the secondary oocyte to finish meiosis II, forming the mature ovum and the second polar body.
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