Why is mitochondrial DNA inherited only from mothers and not fathers?
a. Mitochondria of sperm are defective and not functional due to mutation.
b. Sperm mitochondria fuse into the mother's egg but disintegrate soon after
c. Sperm do not contribute their mitochondria to the zygote during fertilization.
d. Males do not have mitochondrial DNA in any of their cells, including sperm.
e. Sperm cells do not need mitochondria for their function and so have none."
