How Maternal Inheritance Works
Understanding the exclusive transmission of mitochondrial DNA.
Mother's Contribution:
The egg cell from the mother is large and contains thousands of mitochondria, each with its own set of mitochondrial DNA (mtDNA). These are the powerhouses that will fuel the development of the embryo.
Father's Contribution:
Sperm cells also have mitochondria, which they use to power their journey to the egg. However, upon fertilization, the sperm's mitochondria are typically marked for destruction and are not passed on to the offspring.
Result:
As a consequence of this process, virtually all of a person's mitochondrial DNA comes exclusively from their mother. This makes mtDNA a direct and unbroken marker of the maternal lineage, allowing scientists to trace ancestry back through generations of mothers.