Dihybrid - 1 Answer Key to Dihybrid Problems 1 a. b. c. d....

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1 Answer Key to Dihybrid Problems 1 a. 9 bitter, yellow: 3 bitter, no spots: 3 sweet, yellow: 1 sweet, no spots b. 100% bitter, yellow c. 1 bitter, yellow: 1 bitter, no spots: 1 sweet, yellow: 1 sweet, no spots d. 1 bitter, yellow: 1 bitter, no spots: 1 sweet, yellow: 1 sweet, no spots 2. 1/256 3. Two different genes are responsible for obesity in mice. This is an example of duplicate recessive epistasis, where two different genes when homozygous for one or the other or both produce obesity in mice. 4. a. coral is recessive, X-linked, and non-lethal b. black is recessive, autosomal, and non-lethal c. For F 2 of Cross I: 3 coral: 3 wild-type: 1 black: 1 coral & black F o r F 2 of Cross II: 9 wild-type: 3 coral: 3 black: 1 coral & black d. For F 2 of Cross I: X 2 = 0.106, d.f. = 3, P > 0.95, therefore, fail to reject Ho that data fit 3: 3: 1: 1 phenotypic ratio For F 2 of Cross II: X 2 = 0.214, d.f. = 3, P > 0.95, therefore, fail to reject Ho that data fit 9: 3: 3: 1 phenotypic ratio e. Cross I Parents: female = X c X c b + b + and male X c+ Y bb Cross II Parents: female = X c+ X c+ bb and male X c Y b + b + f. 1 wild-type: 1 coral: 1 black: 1 coral & black 5. Star is dominant, autosomal, and lethal when homozygous. Dichaete is dominant, autosomal, and lethal when homozygous. Star and dichaete are located on different autosomes, and there is no gene interaction. Both male and female have the following genotypes: SS + DD + 6. a. Yellow is dominant to gray, autosomal, and lethal when homozygous, while straight is dominant
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Dihybrid - 1 Answer Key to Dihybrid Problems 1 a. b. c. d....

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