A geneticist from an alien planet that prohibits genetic researchbrought with him to Earth two pure-breeding lines of frogs. Oneline croaks by uttering “rib-it rib-it” and has purple eyes. The otherline croaks more softly by muttering “knee-deep knee-deep” andhas green eyes. With a newfound freedom of inquiry, the geneticistmated the two types of frogs, producing F1 frogs that were allutterers and had blue eyes. A large F2 generation then yielded thefollowing ratios:27/64 blue-eyed, “rib-it” utterer12/64 green-eyed, “rib-it” utterer9/64 blue-eyed, “knee-deep” mutterer9/64 purple-eyed, “rib-it” utterer4/64 green-eyed, “knee-deep” mutterer3/64 purple-eyed, “knee-deep” mutterer(a) How many total gene pairs are involved in the inheritance ofboth traits? Support your answer.(b) Of these, how many are controlling eye color? How can youtell? How many are controlling croaking?(c) Assign gene symbols for all phenotypes and indicate thegenotypes of the P1 and F1 frogs.(d) Indicate the genotypes of the six F2 phenotypes.(e) After years of experiments, the geneticist isolated purebreeding strains of all six F2 phenotypes. Indicate the F1 and F2 phenotypic ratios of the following cross using these pure-breeding strains: blue-eyed, “knee-deep” mutterer * purple@eyed, “rib-it” utterer. (f) One set of crosses with his true-breeding lines initially caused the geneticist some confusion. When he crossed truebreeding purple-eyed, “knee-deep” mutterers with truebreeding green-eyed, “knee-deep” mutterers, he often got different results. In some matings, all offspring were blue-eyed, “knee-deep” mutterers, but in other matings all offspring were purple-eyed, “knee-deep” mutterers. In still a third mating, 1/2 blue-eyed, “knee-deep” mutterers and 1/2 purple-eyed, “knee-deep” mutterers were observed. Explain why the results differed. (g) In another experiment, the geneticist crossed two purple-eyed, “rib-it” utterers together with the results shown here: 9/16 purple-eyed, “rib-it” utterer 3/16 purple-eyed, “knee-deep” mutterer 3/16 green-eyed, “rib-it” utterer 1/16 green-eyed, “knee-deep” mutterer What were the genotypes of the two parents?A geneticist from an alien planet that prohibits genetic researchbrought with him to Earth two pure-breeding lines of frogs. Oneline croaks by uttering “rib-it rib-it” and has purple eyes. The otherline croaks more softly by muttering “knee-deep knee-deep” andhas green eyes. With a newfound freedom of inquiry, the geneticistmated the two types of frogs, producing F1 frogs that were allutterers and had blue eyes. A large F2 generation then yielded thefollowing ratios:27/64 blue-eyed, “rib-it” utterer12/64 green-eyed, “rib-it” utterer9/64 blue-eyed, “knee-deep” mutterer9/64 purple-eyed, “rib-it” utterer4/64 green-eyed, “knee-deep” mutterer3/64 purple-eyed, “knee-deep” mutterer(a) How many total gene pairs are involved in the inheritance ofboth traits? Support your answer.(b) Of these, how many are controlling eye color? How can youtell? How many are controlling croaking?(c) Assign gene symbols for all phenotypes and indicate thegenotypes of the P1 and F1 frogs.(d) Indicate the genotypes of the six F2 phenotypes.(e) After years of experiments, the geneticist isolated purebreeding strains of all six F2 phenotypes. Indicate the F1 and F2 phenotypic ratios of the following cross using these pure-breeding strains: blue-eyed, “knee-deep” mutterer * purple@eyed, “rib-it” utterer. (f) One set of crosses with his true-breeding lines initially caused the geneticist some confusion. When he crossed truebreeding purple-eyed, “knee-deep” mutterers with truebreeding green-eyed, “knee-deep” mutterers, he often got different results. In some matings, all offspring were blue-eyed, “knee-deep” mutterers, but in other matings all offspring were purple-eyed, “knee-deep” mutterers. In still a third mating, 1/2 blue-eyed, “knee-deep” mutterers and 1/2 purple-eyed, “knee-deep” mutterers were observed. Explain why the results differed. (g) In another experiment, the geneticist crossed two purple-eyed, “rib-it” utterers together with the results shown here: 9/16 purple-eyed, “rib-it” utterer 3/16 purple-eyed, “knee-deep” mutterer 3/16 green-eyed, “rib-it” utterer 1/16 green-eyed, “knee-deep” mutterer What were the genotypes of the two parents?
A geneticist from an alien planet that prohibits genetic research
brought with him to Earth two pure-breeding lines of frogs. One
line croaks by uttering “rib-it rib-it” and has purple eyes. The other
line croaks more softly by muttering “knee-deep knee-deep” and
has green eyes. With a newfound freedom of inquiry, the geneticist
mated the two types of frogs, producing F1 frogs that were all
utterers and had blue eyes. A large F2 generation then yielded the
following ratios:
27/64 blue-eyed, “rib-it” utterer
12/64 green-eyed, “rib-it” utterer
9/64 blue-eyed, “knee-deep” mutterer
9/64 purple-eyed, “rib-it” utterer
4/64 green-eyed, “knee-deep” mutterer
3/64 purple-eyed, “knee-deep” mutterer
(a) How many total gene pairs are involved in the inheritance of
both traits? Support your answer.
(b) Of these, how many are controlling eye color? How can you
tell? How many are controlling croaking?
(c) Assign gene symbols for all
genotypes of the P1 and F1 frogs.
(d) Indicate the genotypes of the six F2 phenotypes.(e) After years of experiments, the geneticist isolated purebreeding
strains of all six F2 phenotypes. Indicate the F1 and F2
phenotypic ratios of the following cross using these pure-breeding
strains: blue-eyed, “knee-deep” mutterer * purple@eyed, “rib-it”
utterer.
(f) One set of crosses with his true-breeding lines initially
caused the geneticist some confusion. When he crossed truebreeding
purple-eyed, “knee-deep” mutterers with truebreeding
green-eyed, “knee-deep” mutterers, he often got
different results. In some matings, all offspring were blue-eyed,
“knee-deep” mutterers, but in other matings all offspring were
purple-eyed, “knee-deep” mutterers. In still a third mating,
1/2 blue-eyed, “knee-deep” mutterers and 1/2 purple-eyed,
“knee-deep” mutterers were observed. Explain why the results
differed.
(g) In another experiment, the geneticist crossed two purple-eyed,
“rib-it” utterers together with the results shown here:
9/16 purple-eyed, “rib-it” utterer
3/16 purple-eyed, “knee-deep” mutterer
3/16 green-eyed, “rib-it” utterer
1/16 green-eyed, “knee-deep” mutterer
What were the genotypes of the two parents?A geneticist from an alien planet that prohibits genetic research
brought with him to Earth two pure-breeding lines of frogs. One
line croaks by uttering “rib-it rib-it” and has purple eyes. The other
line croaks more softly by muttering “knee-deep knee-deep” and
has green eyes. With a newfound freedom of inquiry, the geneticist
mated the two types of frogs, producing F1 frogs that were all
utterers and had blue eyes. A large F2 generation then yielded the
following ratios:
27/64 blue-eyed, “rib-it” utterer
12/64 green-eyed, “rib-it” utterer
9/64 blue-eyed, “knee-deep” mutterer
9/64 purple-eyed, “rib-it” utterer
4/64 green-eyed, “knee-deep” mutterer
3/64 purple-eyed, “knee-deep” mutterer
(a) How many total gene pairs are involved in the inheritance of
both traits? Support your answer.
(b) Of these, how many are controlling eye color? How can you
tell? How many are controlling croaking?
(c) Assign gene symbols for all phenotypes and indicate the
genotypes of the P1 and F1 frogs.
(d) Indicate the genotypes of the six F2 phenotypes.(e) After years of experiments, the geneticist isolated purebreeding
strains of all six F2 phenotypes. Indicate the F1 and F2
phenotypic ratios of the following cross using these pure-breeding
strains: blue-eyed, “knee-deep” mutterer * purple@eyed, “rib-it”
utterer.
(f) One set of crosses with his true-breeding lines initially
caused the geneticist some confusion. When he crossed truebreeding
purple-eyed, “knee-deep” mutterers with truebreeding
green-eyed, “knee-deep” mutterers, he often got
different results. In some matings, all offspring were blue-eyed,
“knee-deep” mutterers, but in other matings all offspring were
purple-eyed, “knee-deep” mutterers. In still a third mating,
1/2 blue-eyed, “knee-deep” mutterers and 1/2 purple-eyed,
“knee-deep” mutterers were observed. Explain why the results
differed.
(g) In another experiment, the geneticist crossed two purple-eyed,
“rib-it” utterers together with the results shown here:
9/16 purple-eyed, “rib-it” utterer
3/16 purple-eyed, “knee-deep” mutterer
3/16 green-eyed, “rib-it” utterer
1/16 green-eyed, “knee-deep” mutterer
What were the genotypes of the two parents?
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