Molecular Genetics (mtDNA)

Through countless generations, DNA in the nucleus and mtDNA (mitochondrial DNA) have been passed to new generations. It is known that mtDNA is passed only from the mother to the child. By comparing mtDNA of living people and/or of skeletons of non-living people, researchers can analyze samples to determine their ancestry.

Which statement correctly accounts for the fact that mitochondrial DNA is passed only from mother to child?

A) An egg contributes both its nucleus and its cytoplasm to a zygote, and a sperm contributes only its nucleus.

B) Eggs contain mitochondria and sperm do not.

C) Mitochondrial DNA is transcribed from a template on the XY chromosome set.

D) Mitochondrial DNA is transcribed from a template on the XX chromosome set.


I think it's B, but sperms also contain mitochondria and it is located on their tails.
Please Help ! Thank you so much !