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 first go through S phase and then mitosis. Its daughter cells would have 36 chromosomes.
B. The G1 cell would enter mitosis, but would likely arrest at the spindle checkpoint because the chromosomes have not been properly replicated.  
C. The G1 cell would undergo mitosis and its daughter cells would each have 36 chromosomes.
D. The G1 cell would undergo mitosis and its daughter cells would each have 18 chromosomes.


Answer: B

Biology & Microbiology

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