You are working with fruit flies and notie different flies with different eye sh

Question

You are working with fruit flies and notie different flies with different eye shapes, including round, heart shaped, and bar shaped. You cross two pure breeding strains, one with round eyes and one with bar shaped eyes. All the F1 progeny have round eyes. You then cross the F1 flies to each other and count the F2 progeny: 91 round, 31 heart-shaped, and 42 bar shaped.

a) what is the most likely model for how eye shape is inherited: how many genes control it, and how do they interact?

b) which genotypes give rise to which phenotypes?

c) what were the genotypes of the original parents and the F1 flies?

Explanation / Answer

Answer:

a) Two genes control it.
b) Round eyes(RR)=Dominant , heart shaped(Rr)=heterozygous, Bar shaped(rr)=recessive
c) Recessive epistasis, The phenotypic ratio is 9: 3: 4.(92:31:42)
Round shaped- 9/16

heart shaped- 3/16

Bar shaped- 4/16

Original parents : RRRR(Round eyes)*rrrr(Bar shaped eyes)
F1 flies genotype- RrRr

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