One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as…
One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as male. During segregation of $\mathrm{F}_2$ progenies that mutation is found in:
one-third of the progenies
none of the progenies
all the progenies
fifty percent of the progenies.
Solution
Cytoplasmic inheritance or extranuclear inheritance is the transmission of genes that occur outside the nucleus such as mitochondria and chloroplasts or from cellular parasites like viruses or bacteria. In mammals, cytoplasmic genes are only contributed by female gamete, e.g., Male gamete only contribute its nuclear genes. Thus, none progenies would not inherit any mutated genes in mitochondria by father.
Related Theory
The phenotypes that are controlled by nuclear factors found in the cytoplasm of the female are said to express a maternal effect. Those phenotypes controlled by organelle genes exhibit maternal inheritance. The classic phenotype which exhibits maternal effects is coiling direction of snail shells.