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19 May, 07:30

N snails, the shell may either coil to the right or the left. coiling to the right is dominant. a homozygous recessive female snail is crossed with a homozygous dominant male snail. all of the offspring have shells that coil to the left. why do all of the offspring have left-coiled shells

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  1. 19 May, 09:48
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    So first off homozygous means that both alleles are the same

    If coiling to the right is dominant and to the left is recessive let capital c (C) represent right coiling and let lower case c (c) represent left coiling.

    The female who is homozygous recessive must have both recessive alleles

    The male who is homozygous must have two dominant alleles

    So the cross will be between a CC and a cc

    So we set up a Punnett square

    We take a look at all the combinations and arrange them

    So we find that there is a 25% chance of the offspring having left coiling
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