action_center_4 - Practice Problems Genetics Action Center...

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Practice Problems Genetics Action Center 9/22/11 1. In a certain breed of plants, thorns are determined by the dominant gene T and thornless is determined by the recessive gene t . T is 80% penetrant in the heterozygote; 20% of heterozygotes will appear thornless. If you make the parental cross TT x tt ; what would be the expected number of phenotypes observed in a population of 500 F 2 plants? 2. A white-eyed male fly is mated with a purple-eyed female from a true-breeding stock. All the F 1 offspring have wild type (red) eyes. F 1 individuals are mated among themselves to yield the progeny listed in the table: If the purple-eyed male progeny were now crossed to their purple-eyed female siblings, what fraction of these crosses would produce white-eyed progeny? Questions 3-6 pertain to the following cross. A fly heterozygous for three different genes ( AaBbCc ) is testcrossed to a fly homozygous recessive for these three mutations. The following progeny types are produced: 3. What progeny classes represent chromosomes
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action_center_4 - Practice Problems Genetics Action Center...

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