The maternal inheritance of the mitochondrial DNA simply means that the genetic information contained in the mitochondria of the cells of individuals are simply passed on from their mothers: no crossover or recombination would occur, and the mitochondria of fathers would not have any influence on it. Basically, the mitochondrial DNA came from an individual's mother, and would thus, be identical to his/her grandmother's (mother of the mother) mitochondrial DNA, too.
Mitochondrial DNA is inherited maternally. How many of the members of the pedigree (given below) have the same mitochondrial DNA as the shaded individual?
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