question archive 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)
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)
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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, 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.
Answer:
b. Of these, how many control eye colour and how many control croaking?
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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.
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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.
Answer:
