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4 September, 16:13

You are studying body color in an African spider and have found that it is controlled by a single gene with four alleles: B (brown), br (red), bg (green), and by (yellow). B is dominant to all the other alleles, and by is recessive to all the other alleles. The bg allele is dominant to by but recessive to br. You cross a brown (B/by) spider with a pure-breeding green spider. Predict the phenotype of the progeny.

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  1. 4 September, 16:19
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    50% are brown. 50% are green.

    Explanation:

    Given;

    B allele is for brown color, so B = brown,

    br = red,

    bg = green,

    by = yellow.

    B is dominant over all;

    bg is dominant over by;

    br is dominant over bg;

    by is recessive to all other alleles.

    Here, cross between brown (B/by) and pure green (bg/bg).

    B/by * bg/bg

    progeny

    Genotype = B/bg, B/bg, by/bg and by/bg.

    Phenotype = B/bg = brown;

    by/bg = green

    So, 1/2 are brown and 1/2 are green.
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