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Transcript
Dihybrid Crosses –Show a Punnett square for each of the following dihibrid crosses, and tell how many of each phenotype will be present. 1. In tomatoes, tall plants ( T ) are dominant over short plants ( t ). Round fruit (R ) is dominant over oval fruit ( r ). Cross two heterozygous tomato plants with each other. (Show punnett square and phenotypes) 2. In honey bees, black body color (B) is dominant over yellow body color (b). Short bodies (S) are dominant over long bodies (s). Cross a homozygous black, long bodied bee with one that is homozygous recessive for both traits. (Show punnett square and phenotypes) 3. In guinea pigs, smooth hair is due to the dominant gene (S). Curly hair results from the recessive gene (s). Brown color (B) and white color (W) blend to show a brown and white, spotted coat. Cross a spotted guinea pig that is homozygous for smooth hair with one that is heterozygous for both traits. (Show punnett square and phenotypes) 4. In guinea pigs, rough coat (R) is dominant over smooth coat (r) and black (B) is dominant over white ( b ). Cross a homozygous rough, black animal with a smooth, white one. (Show punnett square and phenotypes) 5. Do a Punnett square for the following: cross an individual from the F1 generation from the previous problem with one that is heterozygous for both traits. (Show punnett square and phenotypes) 6. The chestnut coat color of horses is due to a recessive gene, while the dominant gene results in black color. The pacing trait is due to a recessive gene and the trotter’s trait due to a dominant gene. Cross a chestnut pacer with a black trotter that is heterozygous for both genes. (Show punnett square and phenotypes) 7. Some dogs bark while trailing, others are silent. The barking trait is due to a dominant gene. Erect ears are dominant to drooping ears. What kind of pups would be expected from a heterozygous, erect eared barker that is mated to a droop-eared silent trailer? (Show punnett square and phenotypes)