Multiple Choice
If you look at a blood sample from a person who is heterozygous at the sickle cell locus you will see both normal circular red blood cells and sickle-shaped red blood cells. This is an example of
13. Mendelian Genetics
Incomplete Dominance vs. Codominance
Back13. Mendelian Genetics
Incomplete Dominance vs. Codominance
- Multiple Choice
A gene for the MN blood group has codominant alleles M and N. If both children in a family are of blood type M, which of the following situations is possible?
- Multiple Choice
The number of different alleles for ABO blood types is _____ resulting in _____ different blood types.
- Multiple ChoiceWhich of the following matings cannot produce a child with blood type O? The letters refer to blood types (phenotypes).
- Multiple ChoiceFlower 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 __________.
- Multiple ChoiceA 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 __________.
- Multiple ChoiceWhich choice below describes the expression of Tay-Sachs disease in humans at the biochemical level?
- Multiple ChoiceHuman blood groups are governed by three alleles: IA, IB, and i. IA and IB 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?
- Multiple ChoiceHow 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?
- Multiple Choice
You cross two true breeding lines of petunia. One produces red flowers and the other white flowers. The F1
offspring all show pink flowers. You conclude from this that:
- Open QuestionA 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?
- Open QuestionA 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