please need help. professor told me it was wrong Please need help solving! Chall
ID: 57738 • Letter: P
Question
please need help. professor told me it was wrong Please need help solving! Challenge question (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 rib-it" (utterers) Strain 2: the frogs have green eyes and croak by muttering "knee-deep knee- 8. 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? e. Assign gene symbols for all the gene pairs and give the genotypes of the Parental, FI 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 FI and F2 phenotypic ratios of a cross between a blue, mutterer and a purple, uttererExplanation / Answer
Based on the given data, the genotypic ratio of the cross is: 1:1:1:1. So, one strain must be heterozygous dominant and another strain must be homozygous recessive.
Thus, the genotype of strain-I is: PPUU
The genotype of strain-II: ppuu
The F1 from this cross is: PpUu (here, the Pp expresses Blue eyes and the genotype is heterozygous dominant).
Thus, the cross between the F1 and homozygous recessive parent is as follows:
From this cross:
However, the progeny has purple eyes, so eye phenotype is controlled by the two gene pairs. From the cross two gene pairs involved with crock.
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