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Epistasis Problem

Genetics as it applies to evolution, molecular biology, and medical aspects.

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Epistasis Problem

Postby gator » Wed Sep 16, 2009 6:26 pm

Here is the original problem:

Consider the example of epistasis in the coat color of Laborador Retrievers. Recall
that the double recessive homozygote animals are yellow with liver noses and eyes,
instead of yellow with black noses and eyes; many breeders consider these liver-nosed
animals unacceptable. Please describe which crosses should not be performed to
avoid getting any of these liver-nosed yellow animals. Include Punnett squares with all
genotypes and parental and progeny colors indicated for the undesirable crosses only.

This is how I plan to solve the problem..

Double reccessive homozygote are yellow with liver noses and eyes so lets assign (yy) for yellow fur and (ee) for noses and eyes.

yyee X YYEE or yyee X YyEe or yyee X YYEe or yyee x YyEE


If anyone can help me solve this problem I would appreciate it.
Last edited by gator on Wed Sep 16, 2009 11:10 pm, edited 1 time in total.
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Re: Epistasis Problem

Postby gator » Wed Sep 16, 2009 11:09 pm

Never mind I ended up answering my own answer lol. There were ten possible combinations that would yield a double recessive.
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