You are examining offspring (zygotes) of females that may have one or more copies of a...
You are examining offspring (zygotes) of females that may have one or more copies of a recessive mutation in a maternally active segmentation gene. Which of the following zygotes will have a mutant phenotype:
(1) A homozygous zygote that came from a heterozygous mother.
(2) A heterozygous zygote that came from a heterozygous mother.
(3) A heterozygous zygote that came from a homozygous mother.
A. Choices 1 and 2.
B.. Choices 2 and 3.
C. All of these choices.
D. Only choice 3.
Homework Answers
B is the right choice.
Because only mother is passing on the mutant allele. Father is not having the mutant allele. That is why the zygote will be heterozygous. But mother can be either heterozygous or homozygous for the mutant allele. Both possibilities are there for the mother. So, option B is the right one.
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