Question

When does the secondary oocyte undergo meiosis 2?

1) Only after fertilization by a sperm
2) 24 hours after meiosis 1
3) immediately after meiosis 1

Answer 1

at the time of fertilization

Step-by-step explanation:

the secondary oocyte undergoes fertilization only after fertilization by a sperm.

Answer 2

The secondary oocyte completes meiosis II only after it is fertilized by a sperm, leading to the formation of a diploid zygote.

Step-by-step explanation:

The secondary oocyte undergoes meiosis II only after fertilization by a sperm. If a sperm succeeds in penetrating the secondary oocyte as it passes through the Fallopian tube, meiosis II is quickly completed. This results in the formation of a diploid zygote and another polar body, which generally disintegrates. If the secondary oocyte is not fertilized, it does not complete meiosis II and will disintegrate soon thereafter.