Question

What is the status of Meiosis I and Meiosis II?

1) Meiosis I is arrested and Meiosis II is completed if fertilization occurs
2) Meiosis I is completed and Meiosis II is arrested if fertilization occurs
3) Both Meiosis I and Meiosis II are completed if fertilization occurs
4) Both Meiosis I and Meiosis II are arrested if fertilization occurs

Answer 1

If fertilization occurs, Meiosis I is completed and Meiosis II is arrested. If fertilization does not occur, the cells will remain arrested at Meiosis II.

Step-by-step explanation:

The status of Meiosis I and Meiosis II depends on whether fertilization occurs. If fertilization occurs, Meiosis I is completed and Meiosis II is arrested. This means that the homologous chromosomes have separated in Meiosis I and the resulting cells now have half the number of sister chromatids as a diploid cell.

However, Meiosis II is paused and will only continue if fertilization occurs. If fertilization does not occur, the cells will remain arrested at Meiosis II.