Practice Problems Genetics 1306 sp07

Practice Problems Genetics 1306 sp07 - Additional Practice...

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Additional Practice Problems for Bio 1306 Genetics 1. In Squash a gene for white color (W) is dominant over its allele for yellow color (w). Give the genotypic and phenotypic ratios for the results of each of the following crosses: a. WW x ww b. Ww x ww c. Ww x Ww 2. If pollen from the anthers of a heterozygous white-fruited squash plant is placed on the pistil of a yellow-fruited plant, show, using ratios, the genotypes and phenotypes you would expect the seeds from this cross to produce. 3. In human beings, brown eyes are usually dominant over blue eyes. Suppose a blue-eyed man marries a brown-eyed woman whose father was blue eyed. What proportion of their children would you predict will have blue-eyes? 4. A Brown-eyed man whose father was brown-eyed and whose mother was blue-eyed married a blue-eyed woman whose father and mother were both brown-eyed. The couple has a blue-eyed son. For which of the individuals mentioned can you be sure of the genotypes? What are their genotypes? What genotypes are possible for the others? 5. If the litter resulting from the mating of two short-tailed cats contains three kittens without tails, two with long tails, and six with short tails, what would be the simplest way of explaining the inheritance of tail length in these cats? Show genotypes. 6. When Mexican Hairless dogs are crossed with normally-haired dogs, about half the pups are hairless and half have hair. When, however, two Mexican hairless dogs are mated, about a third of the pups produced have hair, about two thirds are hairless, and some deformed puppies are born dead. Explain these results. 7. In peas a gene for tall plants (T) is dominant over its allele for short plants (t). The gene for smooth peas (S) is dominant over its allele for wrinkled peas (s). Calculate phenotypic ratios and genotypic ratios for the results of each of the following crosses: a. Tt Ss x Tt Ss b. Tt ss x tt ss c. tt Ss x Tt ss d. TT ss x tt SS 8. In hogs a gene that produces a white belt around the animals' body is dominant over its allele for a uniformly-colored body. Another independent gene produces fusion of the two hoofs on each foot (an instance of syndactyly); it is dominant over its allele, which produces normal hoofs. Suppose a uniformly-colored hog homozygous for syndactyly is
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mated with a normal-footed hog homozygous for the belted character. What would be
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This note was uploaded on 05/03/2008 for the course BIO 1306 taught by Professor Adair,tamarah during the Fall '08 term at Baylor.

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Practice Problems Genetics 1306 sp07 - Additional Practice...

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