You are examining the effect of maturation-promoting factor (MPF)in sea urchin cells,which have a diploid number of 36.If you fuse a dividing sea urchin cell with a G₁ arrested oocyte,what would be the outcome? A)The G₁ cell would enter mitosis,but would likely arrest at the spindle checkpoint because the chromosomes have not been properly replicated. B)The G₁ cell would undergo mitosis and its daughter cells would each have 36 chromosomes. C)The G₁ cell would undergo mitosis and its daughter cells would each have 18 chromosomes. D)The G₁ cell would first go through S phase and then mitosis.Its daughter cells would have 36 chromosomes.

Question

Quizplus · Accepted Answer

The G₁ cell, which is arrested in G1 phase, would be induced to enter mitosis by the maturation-promoting factor (MPF) from the dividing cell. However, because it has not replicated its DNA (which occurs in S phase), it would likely arrest at the spindle checkpoint due to unreplicated chromosomes, preventing proper segregation.

You Are Examining the Effect of Maturation-Promoting Factor (MPF)in Sea