Mitochondrial DNA in most mammals is inherited only from the mother because a sperm cell contains no mitochondria.

Name: Mitochondrial DNA in most mammals is inherited only from the mother because a sperm cell contains no mitochondria.
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Sperm cells do contain mitochondria, but they are typically located in the midpiece and do not enter the egg during fertilization. Mitochondrial DNA is inherited maternally because the mitochondria in the egg are the ones that persist and replicate in the offspring.

Mitochondrial DNA in Most Mammals Is Inherited Only from the Mother