1. Saguaro cacti have 2 L-shaped arms and you have one with armsthat are different lengths. Arm length in the cactus is controlledby one gene. Arms of the same length (A) are dominant to arms of adifferent length (a). What is the genotype of our cactus? If youcross our cactus with your neighborâs cactus which has arms of thesame length and ½ of the offspring have different length arms. Whatis the genotype of the neighborâs cactus?
2. The ability to curl your tongue up on the sides (T, tonguerolling) is dominant to not being able to roll your tongue (t). Awoman who can roll her tongue marries a man who cannot. Their firstchild has his father's phenotype. What are the genotypes of themother, father, and child? What is the probability that a secondchild will be a tongue roller?
3. A boy, whose parents and grandparents had normal vision is colorblind. What are the genotypes of his mother and his maternalgrandparents? (B = normal vision; bb = color blind)
4. The lubber grasshopper is a very large grasshopper, and is blackwith red and yellow stripes. Assume that red stripes are expressedfrom the homozygous RR genotype, yellow stripes from the homozygousrr genotype and both from the heterozygous Rr genotype. What willbe the phenotypic ration of the F1 generation resulting from across of two grasshoppers, both with red and yellow stripes (Rr xRr)? What would be the genotypic ration of the F1 generation? Whatphenotypes would be produced by crossing a grasshopper with bothcolor stripes and one with only yellow stripes?
5. Coat color in cats is a codominant trait and is also located onthe X chromosome. Cats can be black, yellow or calico. A calico cathas black and yellow splotches. In order to be calico, the cat musthave an allele for the black color and an allele for the yellowcolor. Use a punnet square to show why there are no male calicocats.
6. Consider an individual who has type O blood. Her brother hastype AB. Her fatherâs sister has type AB blood, and her fatherâsfather had a BB genotype. Her motherâs sister has type O blood, andher motherâs brother has type B blood. What are the genotypes ofher mother, father and her four grandparents?
1. Saguaro cacti have 2 L-shaped arms and you have one with armsthat are different lengths. Arm length in the cactus is controlledby one gene. Arms of the same length (A) are dominant to arms of adifferent length (a). What is the genotype of our cactus? If youcross our cactus with your neighborâs cactus which has arms of thesame length and ½ of the offspring have different length arms. Whatis the genotype of the neighborâs cactus?
2. The ability to curl your tongue up on the sides (T, tonguerolling) is dominant to not being able to roll your tongue (t). Awoman who can roll her tongue marries a man who cannot. Their firstchild has his father's phenotype. What are the genotypes of themother, father, and child? What is the probability that a secondchild will be a tongue roller?
3. A boy, whose parents and grandparents had normal vision is colorblind. What are the genotypes of his mother and his maternalgrandparents? (B = normal vision; bb = color blind)
4. The lubber grasshopper is a very large grasshopper, and is blackwith red and yellow stripes. Assume that red stripes are expressedfrom the homozygous RR genotype, yellow stripes from the homozygousrr genotype and both from the heterozygous Rr genotype. What willbe the phenotypic ration of the F1 generation resulting from across of two grasshoppers, both with red and yellow stripes (Rr xRr)? What would be the genotypic ration of the F1 generation? Whatphenotypes would be produced by crossing a grasshopper with bothcolor stripes and one with only yellow stripes?
5. Coat color in cats is a codominant trait and is also located onthe X chromosome. Cats can be black, yellow or calico. A calico cathas black and yellow splotches. In order to be calico, the cat musthave an allele for the black color and an allele for the yellowcolor. Use a punnet square to show why there are no male calicocats.
6. Consider an individual who has type O blood. Her brother hastype AB. Her fatherâs sister has type AB blood, and her fatherâsfather had a BB genotype. Her motherâs sister has type O blood, andher motherâs brother has type B blood. What are the genotypes ofher mother, father and her four grandparents?
