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2 May, 22:40

Two genes, A and B, are located 30 map units apart. A mating between an individual homozygous dominant for both traits and one homozygous recessive for both traits is conducted. The F1 progeny is then test-crossed to a homozygous recessive individual. What proportion of their offspring is expected to be dominant for both traits?

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  1. 2 May, 22:59
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    35%

    Explanation:

    If two genes are 30 map units apart, 30% of the produced gametes will be recombinant.

    A mating between an individual homozygous dominant for both traits (AB/AB) and one homozygous recessive for both traits (ab/ab) is conducted.

    The F1 will be heterozygous for both genes: AB/ab.

    The F1 progeny is then test-crossed to a homozygous recessive individual:

    AB/ab X ab/ab

    The possible offspring will be:

    Parental (70%) : AB/ab and ab/ab Recombinant (30%) : Ab/ab and aB/ab

    Since 30% of all the gametes produced by the F1 individual will be recombinant, 70% will be parental. As there are two types of parental gametes, each of them will have a frequency of 35%.

    The offspring that will have a dominant phenotype for both traits has the genotype AB/ab with a proportion of 35%.
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