The decline of mpf activity at the end of mitosis is due to
a. the destruction of the protein kinase cdk.
b. decreased synthesis of cdk.
c. the degradation of cyclin.
d. the accumulation of cyclin.

c. the degradation of cyclin is the correct answer.

Explanation:

The decline of MPF activity at the end of mitosis is due to the degradation of cyclin.

The MPF stands for maturation promoting factor is an enzyme promotes the passage into M phase from the growth phase (G2 )

During the mitosis process the enzyme which breaks the cyclin gets activated and due to this level of cyclin gets decrease.

The decrease in the levels of the cyclin leads to a decline in the levels of MPF at the end of mitosis.

answer; the male's sperm cells have mitochondria, but because the sperm contributes dna but no cytoplasm, no mitochondria are passed to the egg at ferilization;