Genetics Problems--Codominance
1.
For shorthorn cattle, the mating of a red bull and a white cow produces a calf that is described as a roan. Roan
results from intermingled red and white hairs. Many matings between roan bulls and roan cows produce cattle in the
following ratio: 1 red, 2 roan, 1 white. Is this a problem of codominance of multiple alleles? Explain your answer.
2.
For ABO blood types, the A and B genes are codominant, but both A and B are dominant over type O. Indicate the
blood types possible from the mating of a male who is blood type O with a female of blood type AB. Could a female
with blood type AB ever produce a child with blood type AB? Could she ever have a child with blood type O?
3.
At Prep City Pruppy Mill, there are two kinds of pruppies. One kind has green fur, and the other kind has pink fur.
When a green-fur pruppy is mated with a pink-fur pruppy, the result is a green-and-pink checkered pattern (also
called madras). Please show the Punnett square for this parental cross, and then predict the phenotypes and
genotypes for the F2 generation.
Genetics Problems--Codominance
1.
For shorthorn cattle, the mating of a red bull and a white cow produces a calf that is described as a roan. Roan
results from intermingled red and white hairs. Many matings between roan bulls and roan cows produce cattle in the
following ratio: 1 red, 2 roan, 1 white. Is this a problem of codominance of multiple alleles? Explain your answer.
2.
For ABO blood types, the A and B genes are codominant, but both A and B are dominant over type O. Indicate the
blood types possible from the mating of a male who is blood type O with a female of blood type AB. Could a female
with blood type AB ever produce a child with blood type AB? Could she ever have a child with blood type O?
3.
At Prep City Pruppy Mill, there are two kinds of pruppies. One kind has green fur, and the other kind has pink fur.
When a green-fur pruppy is mated with a pink-fur pruppy, the result is a green-and-pink checkered pattern (also
called madras). Please show the Punnett square for this parental cross, and then predict the phenotypes and
genotypes for the F2 generation.
Genetics Problems--Codominance
1.
For shorthorn cattle, the mating of a red bull and a white cow produces a calf that is described as a roan. Roan
results from intermingled red and white hairs. Many matings between roan bulls and roan cows produce cattle in the
following ratio: 1 red, 2 roan, 1 white. Is this a problem of codominance of multiple alleles? Explain your answer.
2.
For ABO blood types, the A and B genes are codominant, but both A and B are dominant over type O. Indicate the
blood types possible from the mating of a male who is blood type O with a female of blood type AB. Could a female
with blood type AB ever produce a child with blood type AB? Could she ever have a child with blood type O?
3.
At Prep City Pruppy Mill, there are two kinds of pruppies. One kind has green fur, and the other kind has pink fur.
When a green-fur pruppy is mated with a pink-fur pruppy, the result is a green-and-pink checkered pattern (also
called madras). Please show the Punnett square for this parental cross, and then predict the phenotypes and
genotypes for the F2 generation.