solve the dilemma

1. In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted).

a. What is the genotype for black chickens? _BB___

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b. What is the genotype for white chickens? __WW__

c. What is the genotype for erminette chickens? __BW__

2. If two erminette chickens were crossed, what is the probability that:

a. They would have a black chick? __25__%

b. They would have a white chick? __25__%

Parents: ____ X ____

3. Two short-tailed (Manx) cats are bred together. They produce three kittens with long tails, five short tails, and two without any tails. From these results, how do you think tail length in these cats are inherited? Show the genotypes for both the parents and the offspring to support your answer.

4. In snapdragons, flower color is controlled by incomplete dominance. The two alleles are red (R)

and white (R’). The heterozygous genotype is expressed as pink.

a. What is the phenotype of a plant with the genotype RR? ____RED_______

b. What is the phenotype of a plant with the genotype R’R’? ___WHITE________

c. What is the phenotype of a plant with the genotype RR’? ____PINK_______

5. A pink-flowered plant is crossed with a white-flowered plant. What is the probability of producing a pink-flowered plant? __50__%

Parents: ____ X ____

6.Write the genotype for each person based on the description:

a.Homozygous for the “B” allele ______

b.Heterozygous for the “A” allele ______

c.Type O ______

d.Type “A” and had a type “O” parent ______

e.Type “AB” ______

f.Blood can be donated to anybody ______

g.Can only get blood from a type “O” donor ______

7.Pretend that Brad Pitt is homozygous for the type B allele, and Angelina Jolie is type “O.” What are all the possible blood types of their baby? (show your work)

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