Which of these statements describes oogenesis
A)The first meiotic division occurs just prior to ovulation, and the second meiotic division is triggered by fertilization.
B)It is triggered by release of estrogen.
C)Oogonia proliferate mitotically throughout the reproductive life of a female.
D)It begins after a baby girl is born and is triggered by release of estrogen.

Question

Quizplus · Accepted Answer

Oogenesis is the process of producing female gametes or ova. The first meiotic division occurs in the ovary before birth, but it is arrested in the prophase stage until puberty. At puberty, the first meiotic division is triggered, and an ovum is produced. The second meiotic division is triggered by fertilization, and it is completed after the sperm penetrates the ovum. So, statement A correctly describes oogenesis.

B, C, and D are incorrect descriptions of oogenesis. Estrogen does play a role in regulating oogenesis, but it does not trigger it. Oogonia proliferate mitotically only until the fifth month of fetal development, and after that, the number of germ cells in the ovary decreases over time. Oogenesis starts before birth, not after a baby girl is born.

Which of These Statements Describes Oogenesis