Question 44 (1 point) Assume that lzy is a trait characterized by a lack of ener

Question

Question 44 (1 point)

Assume that lzy is a trait characterized by a lack of energy and it results from a mutation in a gene found only in the mitochondrial DNA. A woman who shows normal energy mates with a man who shows lzy, what proportation of their children (male and female) will show normal energy??

Question 44 options:

1/2 of the males and 1/2 of the females

all males and 1/2 of the females

none of the males and all of the females

none of the males and none of the females

all of the males and all of the females

1/2 of the males and 1/2 of the females

all males and 1/2 of the females

none of the males and all of the females

none of the males and none of the females

all of the males and all of the females

Explanation / Answer

None of the males and none of the females.

Mitochondrial inheritence is maternal inheritance, that is, mitochondria are inherited from mother only. During fertilization of egg, only the nucleus of the male gamete fuses with the female gamete whereas the cytoplasm of the egg and its organelle are retained. Therefore, after fertilization, the zygote has its mitochondria derived from the egg, but not from the sperm. Therefore, only the maternal genotype is expressed in case of mitochondria.

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