Clemclem
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#1
Report Thread starter 7 years ago
#1
Can somebody explain this genetics question to me? Image

Coat colour in mice is controlled by two genes. Gene 1 controls whether fur is coloured (C) or albino (c). Gene 2 controls whether the colour is grey (G) or black (g). Gene 1 is epistatic over gene 2. Describe and explain the phenotypic ratio produced in F2 generation from a CCGG x ccgg cross.

I don't understand how you know which type of epistasis is happening :/

Thanks
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burtondog
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#2
Report 7 years ago
#2
This is recessive epistasis because if the genotype is cc it masks the other gene - it can be GG Gg or gg but it will still be albino.

In this cross all the offspring will be CcGg and so will all be grey
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