After determining that both y and e are recessive mutations, you decide to determine if these...
After determining that both y and e are recessive mutations, you decide to determine if these genes interact, since they both affect melanin accumulation but in opposite ways. To do this you make the following cross:
y/y, E/E (yellow ♀) X Y/Y, e/e (ebony ♂)
Show the genotypes which would segregate in the F1 and F2 generations with their expected ratios. Assume the two genes are unlinked and segregate independently
Homework Answers
yyEE * YYee
YyEe ( F1)
F1 cross is
YyEe * YyEe
| YE | Ye | yE | ye | |
| YE | YYEE | YYEe | YyEE | YyEe |
| Ye | YYEe | YYee | YyEe | Yyee |
| yE | YyEE | YyEe | yyEE | yyEe |
| ye | YyEe | Yyee | yyEe | yyee |
if the genes assort independently the expected genotypic ratio is
YYEE:YYEe:YyEE:YyEe:YYee:Yyee:yyEE:yyEe:yyee=1:2:2:4:1:2:1:2:1
( phenotype of the double mutant is not given)
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