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27 March, 10:25

In flies, red eyes (R) are dominant to brown eyes (r). A heterozygous fly is crossed with a homozygous recessive fly

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  1. 27 March, 12:54
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    The cross of a heterozygous fly with a homozygous fly can be shown as follows:

    r r

    R Rr Rr

    r rr rr

    The results show that there is a 50% probability that the flies produced will have red eyes. Their genotypes will be heterozygous.

    The results of the punnet square show that there will be a 50% probability that the offsprings will have brown eyes. Their genotype will be homozygous recessive.

    A homozygous trait can be described as a trait which has same alleles for the gene which encodes the trait. Heterozygous means that both the alleles for the trait will be different.
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