Chapter 12: Q. 31 (page 328)
Explain epistasis in terms of its Greek-language roots “standing upon.”
The interplay of genes which affects a phenotype is referred as epistasis.
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If black and white true-breeding mice are mated and the result is all gray offspring, what inheritance pattern would this be indicative of?
a. dominance
b. codominance
c. multiple alleles
d. incomplete dominance
Consider a cross to investigate the pea pod texture trait, involving constricted or inflated pods. Mendel found that the traits behave according to a dominant/recessive pattern in which inflated pods were dominant. If you performed this cross and obtained 650 inflated-pod plants in the F2 generation, approximately how many constricted-pod plants would you expect to have?
a. 600
b. 165
c. 217
d. 468
A farmer raises black and white chickens. To his surprise, when the first generation of eggs hatch all the chickens are black with white speckles throughout their feathers. What should the farmer expect when the eggs laid after interbreeding the speckled chickens hatch?
a. All the offspring will be speckled.
b. 75% of the offspring will be speckled, and 25% will be black.
c. 50% of the offspring will be speckled, 25% will be black, and 25% will be white.
d. 50% of the offspring will be black and 50% of the offspring will be white.
Assuming no gene linkage, in a dihybrid cross of AABB x aabb with AaBb F1 heterozygotes, what is the ratio of the F1 gametes (AB, aB, Ab, ab) that will give rise to the F2 offspring?
a. 1:1:1:1
b. 1:3:3:1
c. 1:2:2:1
d. 4:3:2:1
In Section 12.3, “Laws of Inheritance,” an example of epistasis was given for the summer squash. Cross white WwYy heterozygotes to prove the phenotypic ratio of 12 white:3 yellow:1 green that was given in the text.
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