Question

8. Challenge problem (20 marks) 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" (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, lerens 964 blue, mutterers 964 purple, utterers 464 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. Answer: b. Of these, how many control eye colour and how many control croaking? Answer: c. Assign gene symbols for all the gene pairs and give the genotypes of the Parental, Fl and the genotypes for all of the six F2 phenotypes. Answer: d. After many years, the geneticist isolated true- breeding lines of all six F2 phenotypes. Give the FI and F2 phenotypic ratios of a cross between a blue, mutterer and a purple, utterer. Answer: