Question

Under what condition does the secondary oocyte complete meiosis II?

Options

• When the corpus luteum secretes progesterone

• When the LH surge peaks on Day 14

• Only if fertilization by a sperm occurs

• As soon as it is picked up by the fimbriae

Answer 1

The secondary oocyte released at ovulation is arrested in metaphase II. Meiosis II completes only if fertilization occurs. Without fertilization, the secondary oocyte degenerates and never becomes a mature ovum.