7Feb/090
Chapter 5 Question 14(g): Recessive Epistasis
From a studious student:
I was hoping you could help me with the homework. I am working on problem 14 and I am confused on 2 parts, g and i.g: I recognize that there is recessive epistasis, but I am a little confused as to what that means. The answer key says that two of the classes of the F2 have the same phenotype. Which ones? When I do the cross, I get the typical 4 phenotypes, 1: A-B-, 2: aaB-, 3: A-bb and 4: aabb.
1: Both genes show
2: Only a shows
3: Only b shows
3: Perhaps both a and b show?
Recessive epistasis means that the recessive homozygote (aa or bb) is 'dominant' to any combination of dominant genes. Thus you should see the following genotype to phenotype pairs:
- A-B- = unique phenotype x
- --bb = unique phenotype y
- --aa = unique phenotype z
- aabb = one of the phenotypes from 2 or 3 (e.g. y or z)
* take a look at page 60 and figure 3.14 in the text if you're still confused.
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