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21 February, 13:36

Examine a two-gene cross that follows simple Mendelian inheritance of freckles and eyebrow shape between a woman with genotype Mmpp and a man with genotype mmpp. How many phenotypes are possible in their offspring and in what ratio?

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  1. 21 February, 15:00
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    There are two phenotype possible in the offspring:

    i) freckles and recessive trait for eyebrow shape i. e slender

    ii) no freckles and recessive for eyebrow shape.

    phenotype ratio is 2:2 0r 1:1

    Explanation:

    Data given:

    freckles are dominant trait = Mm

    no freckles are recessive = mm

    the couple is having recessive trait for eyebrow shape = pp

    The genotype of man = Mmpp

    genotype of woman = mmpp

    the cross between them is shown in punnet square below:

    Mp mp

    mp Mmpp mmpp

    mp Mmpp mmpp

    the phenotype expressed are

    freckles and recessive trait for eyebrow shape i. e slender

    no freckles and recessive for eyebrow shape.

    phenotype ratio is

    2:2

    The ratio shows that there is 50% probability of offspring having either mother's or father's genotype and phenotype.
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