Human blood groups are governed by three alleles: I^A, I^B, and i. I^A and I^B are codominant and i is recessive to both. A man who has type B blood and a woman who has type A blood could have children of which of the following phenotypes?

Which of the following matings cannot produce a child with blood type O? The letters refer to blood types (phenotypes).

Flower color in snapdragons is an example of incomplete dominance. When a red-flowered plant is crossed with a white-flowered plant, the F₁ generation has pink flowers. If a pink-flowered plant is crossed with another pink-flowered plant, the progeny plants will be __________.

A red bull is crossed with a white cow and all of the offspring are roan, an intermediate color that is caused by the presence of both red and white hairs. This is an example of genes that are __________.

Which choice below describes the expression of Tay-Sachs disease in humans at the biochemical level?

How does codominance at the molecular level help to explain why evolutionary processes haven't resulted in the elimination of the sickle-cell allele among people of African descent?

A man with type A blood marries a woman with type B blood. Their child has type O blood. What are the genotypes of these three individuals? What genotypes, and in what frequencies, would you expect in future offspring from this marriage?

A man with type B blood and a woman who has type A blood could have children of which of the following phenotypes?a. A or B onlyb. AB onlyc. AB or Od. A, B, AB, or O