Thanks! Suppose two independently assorting genes are involved in the pathway th

Question

Thanks!

Suppose two independently assorting genes are involved in the pathway that determines 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 Wallele codes for a dominant white phenotype, whereas the w allele codes for a colored squash. At the second locus, the allele Y codes for a dominant yellow phenotype, and the allele y codes for a recessive green phenotype. 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 fírst locus. This masking pattern is known as dominant epistasis. A dihybrid quash, WwYy, is selfed, and produces 128 offspring. How many offspring are expected to have each of the following phenotypes? Number White = Number Yellow = Number Green =

Explanation / Answer

given
WwYy dihybrid squash is selfed, producing 128 offsprings
now, WwYy x WwYy gives us following results
and, if W is present in first locus, color will be white
WWYY -> white
WwYY -> white
wWYY -> white
wwYY -> yellow
WWYy -> white
WwYy -> white
wWYy -> white
wwYy -> yellow
WWyY -> white
WwyY -> white
wWyY -> white
wwyY -> yellow
WWyy -> white
Wwyy -> white
wWyy -> white
wwyy -> green

hence out of 128 offsprings
white = 128*12/16 = 96
yellow = 128*3/16 = 24
green = 128*1/16 = 8

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