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calculate the probability of homozygous dominant offspring result from a cross between two heterozygous parents

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1/4. Make a Punnett square and plug in the two heterozygous genotypes of the parents, put them together and you get the following possible genotypes: AA, Aa, Aa, and aa. One of those is homozygous dominant. 1/4 or 25 percent.

User Yildiz
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