Multiple Choice
In humans, how many chromosomes are present in a typical somatic (diploid) cell?
17
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17. Meiosis and Sexual Reproduction
Basics of Meiotic Genetics
Multiple Choice
In human oogenesis (basics of meiotic genetics), when do oogonia primarily undergo mitosis to increase their number?
A
During childhood, just before puberty begins
B
After fertilization, during completion of meiosis II
C
During fetal development, before they enter meiosis I
D
At each menstrual cycle immediately prior to ovulation
Verified step by step guidance1
Understand the stages of human oogenesis: Oogonia are the precursor germ cells that eventually develop into mature ova (eggs). Their proliferation and development occur in distinct phases.
Recall that oogonia undergo mitosis to increase their numbers before entering meiosis. This mitotic division happens during fetal development, which is before the cells enter meiosis I.
Recognize that after the mitotic phase, oogonia enter meiosis I and become primary oocytes. These primary oocytes then arrest in prophase I until puberty.
Note that after birth and during childhood, no further mitosis of oogonia occurs; instead, the primary oocytes remain arrested until puberty.
Understand that completion of meiosis II only occurs after fertilization, and mitosis does not happen at this stage.
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