Colorado School of Mines
CBEN 110
Genetics Review Questions Key 1 Problems Involving One Gene 1. (+1) Two cats are mated. One of the parent cats is long-haired (recessive allele). The litter which results contains two short-haired and three longhaired kittens. What does the second parent look like, and what is its genotype? P1= ss = long-haired X P2 = Ss = short-haired Expe
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Genetics Review Questions Key 1 Problems Involving One Gene 1. (+1) Two cats are mated. One of the parent cats is long-haired (recessive allele). The litter which results contains two short-haired and three longhaired kittens. What does the second parent look like, and what is its genotype? P1= ss = long-haired X P2 = Ss = short-haired Expect 50/50 offspring long-haired/short-haired 2. (+1) Mr. and Mrs. Anderson both have tightly curled hair. (The hair form gene shows incomplete dominance. There are two alleles, curly and straight. The heterozygote has wavy hair.) The Andersons have a child with wavy hair. Mr. Anderson accuses Mrs. Anderson of being unfaithful to him. Is he necessarily justified? Why or why not? Tightly curled hair = AA or aa Wavy hair = Aa Mrs. Anderson has been getting busy 3. (+2) Basic body color for horses is influenced by several genes, on of which has several different alleles. Two of these alleles—the chestnut (dark brown) allele and a diluting (pale cream) allele (often incorrectly called ‘albino’)—display incomplete dominance. A horse heterozygous for these two alleles is a palomino (golden body color with flaxen mane and tail). Is it possible to produce a herd of pure-breeding palomino horses? Why or why not? Work the Punnett’s square for mating a palomino to a palomino and predict the phenoty
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