A geneticist from an alien planet that prohibits genetic research brought with him two true-breeding lines of frogs. One frog line croaks by uttering “rib-it rib-it" and has purple eyes. The other frog line croaks by muttering “knee-deep knee-deep" and has green eyes. He mated the two frog lines, producing F1 frogs that were all utterers with blue eyes. A large F2 generation then yielded the following ratios: 27/64 blue, utterer 12/64 green, utterer 9/64 blue, mutterer 9/64 purple, utterer 4/64 green, mutterer 3/64 purple, mutterer (a) How many total gene pairs are involved in the inheritance of both eye color and croaking? (b) Of these, how many control eye color, and how many con- trol croaking? (c) Assign gene symbols for all phenotypes, and indicate the genotypes of the Pi, F1, and F2 frogs. (d) After many years, the frog geneticist isolated true-breeding lines of all six F2 phenotypes. Indicate the F1 and F2 phe- notypic ratios of a cross between a blue, mutterer and a purple, utterer.

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In another cross, the frog geneticist from attached problem mated two purple, utterers with the results shown here. What were the
genotypes of the parents?

9/16 purple, utterers
3/16 purple, mutterers
3/16 green, utterers
1/16 green, mutterers

A geneticist from an alien planet that prohibits genetic research
brought with him two true-breeding lines of frogs. One frog
line croaks by uttering “rib-it rib-it" and has purple eyes. The
other frog line croaks by muttering “knee-deep knee-deep" and
has green eyes. He mated the two frog lines, producing F1 frogs
that were all utterers with blue eyes. A large F2 generation then
yielded the following ratios:
27/64 blue, utterer
12/64 green, utterer
9/64 blue, mutterer
9/64 purple, utterer
4/64 green, mutterer
3/64 purple, mutterer
(a) How many total gene pairs are involved in the inheritance
of both eye color and croaking?
(b) Of these, how many control eye color, and how many con-
trol croaking?
(c) Assign gene symbols for all phenotypes, and indicate the
genotypes of the Pi, F1, and F2 frogs.
(d) After many years, the frog geneticist isolated true-breeding
lines of all six F2 phenotypes. Indicate the F1 and F2 phe-
notypic ratios of a cross between a blue, mutterer and
a purple, utterer.
Transcribed Image Text:A geneticist from an alien planet that prohibits genetic research brought with him two true-breeding lines of frogs. One frog line croaks by uttering “rib-it rib-it" and has purple eyes. The other frog line croaks by muttering “knee-deep knee-deep" and has green eyes. He mated the two frog lines, producing F1 frogs that were all utterers with blue eyes. A large F2 generation then yielded the following ratios: 27/64 blue, utterer 12/64 green, utterer 9/64 blue, mutterer 9/64 purple, utterer 4/64 green, mutterer 3/64 purple, mutterer (a) How many total gene pairs are involved in the inheritance of both eye color and croaking? (b) Of these, how many control eye color, and how many con- trol croaking? (c) Assign gene symbols for all phenotypes, and indicate the genotypes of the Pi, F1, and F2 frogs. (d) After many years, the frog geneticist isolated true-breeding lines of all six F2 phenotypes. Indicate the F1 and F2 phe- notypic ratios of a cross between a blue, mutterer and a purple, utterer.
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