In snapdragons, the color of the flower is controlled by incomplete dominance. The two alleles are red (R) and white (r). What is genotype of a pink snapdragon?

A. WW
Incorrect. This snapdragon’s phenotype would be white.

B. RR
Incorrect. This snapdragon’s phenotype would be red.

C. RW
Correct! Since the snapdragon is controlled by incomplete dominance, one allele for red (R), and one for white (W), would result in a pink flower.

D. ww
Incorrect. This is not written correctly.

In snapdragons, the color of the flower is controlled by incomplete dominance. The two alleles are red (R) and white (W). If a pink-flowered plant is crossed with a white-flowered plant, what is the probability of producing a pink-flowered plant? (Hint: Draw a Punnett square to help you answer the question.)

A. 25%
Incorrect. The genotype for the pink flower is RW, and the genotype for the white flower is WW. This would lead to a 50 percent chance of the offspring having a phenotype of pink.

B. 50%
Correct! The genotype for the pink flower is RW, and the genotype for the white flower is WW. This would lead to a 50 percent chance of the offspring having a phenotype of pink.

C. 75%
Incorrect. The genotype for the pink flower is RW, and the genotype for the white flower is WW. This would lead to a 50% chance of the offspring having a phenotype of pink.

D. 0%
Incorrect. The genotype for the pink flower is RW, and the genotype for the white flower is WW. This would lead to a 50% chance of the offspring having a phenotype of pink.

Bernadette is blood type O. She has two sisters. One sister has blood type A, and the other sister has blood type B. Using this information and your knowledge of how blood type is determined, determine the genotypes of Bernadette's parents for this trait.

A. I^Ai, I^Bi
Correct! The genotype for blood type O (Bernadette’s type) is “ii”, so both parents must have at least on “i”. Since one sister is blood type B, one parent must have the I^B allele. Since, the other sister is blood type A, then one parent must have the I^A allele.

B. I^AI^A, I^AI^A
Incorrect. This would result in children with only type A blood.

C. I^BI^B, I^BI^B
Incorrect. This would result in children with only type B blood.

D. I^Bi, I^Bi
Incorrect. This would result in offspring with either type O blood or type B.

An expectant mom has blood type O,  and the dad has blood type AB. What are the possible blood types for their offspring?

A. 50% heterozygous with blood type A and 50% homozygous with blood type O
Incorrect. Blood type O must have the homozygous genotype of “ii”, and since dad’s blood type is AB, then his genotype is I^AI^B.

B. 25% heterozygous with blood type A and 75% heterozygous with blood type B
Incorrect. Blood type O must have the homozygous genotype of “ii”, and since dad’s blood type is AB, then his genotype is I^AI^B.

C. 25% heterozygous with blood type B and 75% heterozygous with blood type A
Incorrect. Blood type O must have the homozygous genotype of “ii”, and since dad’s blood type is AB, then his genotype is I^AI^B.

D. 50% heterozygous with blood type A and 50% heterozygous with blood type B
Correct! Blood type O must have the homozygous genotype of “ii”, and since dad’s blood type is AB, then his genotype is I^AI^B.

In horses, the Palomino (gold) color is the result of a cross between a purebred Chestnut (brown) and a purebred Cremello (off-white). A male Chestnut horse, BB, is crossed with a female Cremello horse, CC. The resulting offspring are all 100 percent Palomino horses, BC. What type of non-Mendelian inheritance does the Palomino horse exhibit?

A. Sex-linked inheritance
Incorrect. Coat color is not a sex-linked inherited trait.

B. Multiple allele inheritance
Incorrect. This is not an example of multiple allele. In multiple allele inheritance, there are more than two alleles that code for a trait. This is a mixing of two dominant alleles.

C. Codominance inheritance
Incorrect. In codominance inheritance, the offspring would express both phenotypes of the parents. So, the offspring would have both brown and off-white colored patches of hair.

D. Incomplete dominance inheritance
Correct! With incomplete dominance, there is a mixing or blending of the parental traits.