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4 May, 16:20

What fraction of offspring of the cross AaBb * AaBb would be homozygous for both the dominant alleles, assuming that they are on different chromosomes?

A. 1/16B. 1/8C. 1/64D. 1/4E. 1/32

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  1. 4 May, 16:37
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    A. 1/16

    Explanation:

    If we break the dihybrid cross of AaBb X AaBb into individual monohybrid crosses:

    Aa X Aa:

    A a

    A AA Aa

    a Aa aa

    1/4 of the progeny will be homozygous for dominant allele (AA)

    Similarly, in cross Bb X Bb 1/4 of the progeny will be homozygous for dominant allele (BB)

    Hence, in cross AaBb X AaBb:

    1/4 * 1/4 = 1/16 will be homozygous for both the dominant alleles.
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