Step-by-Step Solution
a. The unusual fact about the pedigree that is given in the question is the total absence of male progeny.
Secondly, the trait 'lack of male offspring' is carried by all the progeny that mates.
If the absence of male is nuclear, this absence of male members would be expected to alter by the father.
So, in this case cytoplasmic inheritance is suggested. Cytoplasmic inheritance is the inheritance that occurs outside the nucleus.
b. The pattern cannot be explained by Mendelian inheritance.
If the females resulted just by chance, the probability of having this is 
.
Here, n represents the number of female births and in this case it is 72. There is no explanation for this.
We can assume that this is a mutation in mitochondria which is lethal for males only. The autosomal dominant inheritance, sex limited lethal trait could not explain to get a right answer.
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