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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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colleen colleen
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10 years ago
In peas, gray seed color is dominant to white. For the purposes of this question, assume that Mendel crossed plants with gray seeds with each other and the following progeny were produced: 320 gray and 80 white.

(a) What is the most probable genotype of each parent?
(b) What genotypic and phenotypic ratios are expected in the progeny of such a cross? 
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padrepadre
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10 years ago
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10 years ago
A. Based on the results of the testcross being 320 Grey and 80 white, it is safe to assume that the most probable genotype for the parents is two heterozygotes (Meaning, assuming G is your dominant, Grey allele and g is your recessive white allele, both parents were probably Gg)
B. Your expected genotypic ratio would be 1:2:1 (homozygous dominant:heterozygous:homozygous dominant) and your expected phenotypic ratio would be 3:1 (Dominant trait:Recessive trait)
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