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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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nasmnt nasmnt
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11 years ago
(P0) a strain of Shepherd’s purse with oval seed pods is crossed with a strain with triangular seed pods. The F2 had phenotypes of 375 triangular, 94 round, and 31 oval seed pods.
a)   what type of inheritance pattern does pod shape in this strain of Shepherd’s purse exhibit?
b)   what was the phenotype of the F1 seed pods?

it'a a 12:3:1 ration, dominant epistatsis, but how do I know what the F1 looked like?
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Staff Member
11 years ago
That ratio means it is single dominant epistasis. Here, the dominant allele for a gene (the epistatic gene) may mask the effect of another allele for another gene (the Hypostatic gene)).

Epistasis is the interaction between genes. Epistasis takes place when the action of one gene is modified by one or several other genes, which are sometimes called modifier genes. The gene whose phenotype is expressed is said to be epistatic, while the phenotype altered or suppressed is said to be hypostatic.
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