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20 February, 15:47

The first child born to two parents with brown eyes has blue eyes. draw a punnett square to show how it is possible for these parents to have a blue eyed child

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  1. 20 February, 16:01
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    Both parents have to be heterozygous for the trait (Xx)

    X. x

    X. XX. Xx

    x. Xx. xx

    As you can see, in the further corner, there is a homozygous recessive genotype. (xx). This means that 1/4 of all offspring will have blue eyes. Or 25%
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