Epistasis and Complementation Video Lessons

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Problem: Suppose two independently assorting genes are involved in the pathway that determine fruit color in squash. These genes interact with each other to produce the squash colors seen in the grocery store.At the first locus, the W allele codes for a dominant white phenotype, whereas the w allele codes for colored squash. A the second locus, the allele Y codes for a dominant yellow phenotype, and the allele y codes for a recessive green phenotoype. The phenotypes from the first locus will always mask the phenotype produced by the second locus if the dominant allele (W) is present at the first locus. This masking pattern is known as the dominant epistasis.A dihybrid squash, WwYy, is selfed and produces 160 offspring. How many offspring are expected to have each of the following phenotypes?White = Yellow =Green = 

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Given: WwYy × WwYy

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Problem Details

Suppose two independently assorting genes are involved in the pathway that determine fruit color in squash. These genes interact with each other to produce the squash colors seen in the grocery store.

At the first locus, the W allele codes for a dominant white phenotype, whereas the w allele codes for colored squash. A the second locus, the allele Y codes for a dominant yellow phenotype, and the allele y codes for a recessive green phenotoype. The phenotypes from the first locus will always mask the phenotype produced by the second locus if the dominant allele (W) is present at the first locus. This masking pattern is known as the dominant epistasis.

A dihybrid squash, WwYy, is selfed and produces 160 offspring. How many offspring are expected to have each of the following phenotypes?

White = 

Yellow =

Green = 

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