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One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F2 progenies that mutation is found in

1. one-third of the progenies
2. none of the progenies
3. all the progenies
4. fifty percent of the progenies

Correct answer: none of the progenies

Solution

Mitochondria are usually inherited maternally, because the egg contributes the cytoplasm to the zygote while the sperm contributes little or no mitochondria. So if the mutated parent is the male, the F2 progeny will not inherit that mitochondrial mutation.

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