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2 November, 18:04

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.

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  1. 2 November, 20:50
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    Answer is only 1st case that is homozygous zygote is the right answer.

    Explanation:

    In maternal recessive mutation both the alleles are mutant and exhibit mutant phenotype. The mutated alleles are present as homozygous.

    From the definition it is concluded that:

    first case, homozygous zygote is mutant phenotype

    second case, heterozygous zygote not mutant phenotype

    in third case, heterozygous zygote not mutant phenotype.
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