Principles of Inheritance and Variation Question 175

175. 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 $F_2$ progenies that mutation is found in

[2004]

(a) one-third of the progenies

(b) none of the progenies

(c) all the progenies

(d) fifty percent of the progenies

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Answer : b

Hints & Solution

(b) Mitochondrion is an organelle present in the cytoplasm. A zygote receives its cytoplasm from the female parent gamete. Hence in the given question, the $F_2$ progeny receive the mitochondrial genome from the female parent, so mutation is not passed to progeny.



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