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23 May, 00:51

In a species of birds, blue feathers (B) are incompletely dominant to the gene for white feathers (b). Individuals that are heterozygous (Bb) have blue-tipped feathers. A bird with blue-tipped feathers is crossed with a white bird. What is the chance that the offspring will have blue feathers

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  1. 23 May, 02:40
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    Explanation:

    The chance that the offspring will have blue feather is 0.

    From the illustration, blue feather with allele B exhibit incomplete dominance over white feather with allele b to give a blue-tipped feather phenotype.

    Blue-tipped feathers bird will have the genotype Bb.

    White feather bird will have the genotype bb.

    Crossing both Bb and bb:

    Bb x bb = Bb, Bb, bb, bb

    Offspring

    2 Bb - blue-tipped feather

    2 bb - white feather

    None of the offspring will have a blue feather. Hence the chance of the offspring having blue feathers is zero.
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