On a newly discovered island in the South Pacific, a geneticist found two distin

Question

On a newly discovered island in the South Pacific, a geneticist found two distinct pure?breeding populations of frogs: Strain 1:  the frogs have purple eyes and croak by uttering rib?it rib?it (utterers) Strain 2: the frogs have green eyes and croak by muttering knee?deep knee? deep (mutterers) She mated frogs from the two lines, producing F1 frogs that were all utterers with blue eyes. A large F2 generation then yielded the following ratio:

27/64 blue, utterers

12/64 green, utterers

9/64 blue, mutterers

9/64 purple, utterers

4/64 green, mutterers

3/64 purple, mutterers

a. How many total gene pairs are involved in the inheritance of both eye colour and croaking? Justify your answer.

b. Of these, how many control eye colour and how many control croaking?

c. Assign gene symbols for all the gene pairs and give the genotypes of the Parental, F1 and the genotypes for all of the six F2 phenotypes.

d. After many years, the geneticist isolated true?breeding lines of all six F2 phenotypes. Give the F1 and F2 phenotypic ratios of a cross between a blue, mutterer and a purple, utterer.

Explanation / Answer

1. in total four gene pairs were involved. ( PP --- PURPLE , UU ---- UTTERING , GREEN ---- gg , MUTTERING --- mm )

2. of these two pairs control eye color , two pairs control croaking ).

3. purple eyes ---- PP , green color ---- gg , uttering ---- UU , muttering --- mm

Parental genotype ----- PPUU * ggmm

F1 ------- PPUU

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