A kind of inheritance where the expression of extranuclear DNA found in the ovum during fertilization causes the traits of the progeny to be maternal in origin.
Mitochondria:
Mitochondrial DNA is a DNA found in mitochondria.
Mitochondrial DNA makes up a modest percentage of a eukaryotic cell's DNA. 16,569 base pairs of mitochondrial DNA is encoded by only 37 genes.
It is inherited solely from the mother in most organisms, including humans.
As a result, mitochondria are in charge of maternal inheritance.