During oogenesis,
A) thousands of primary oocytes are formed.
B) one primary oocyte yields 16 mature ova.
C) one primary oocyte yields 1 mature ovum.
D) each ovum contains 46 chromosomes at the time of ovulation.
E) sex hormones reach their lowest levels.

Question

Quizplus · Accepted Answer

During oogenesis, one primary oocyte yields one mature ovum. This is because during meiosis I, the primary oocyte divides unequally, yielding one secondary oocyte and one polar body. The secondary oocyte then proceeds into meiosis II, but only completes it if fertilization occurs. If fertilization does occur, the secondary oocyte divides unequally again, yielding one haploid ovum and one polar body. Therefore, only one ovum is produced from each primary oocyte.

During Oogenesis