1. A pea plant with yellow seeds is crossed with a pea plant with green seeds. All of the offspring have yellow seeds. The allele for yellow seeds is

A. dominant because all the offspring have yellow seeds.

B. recessive because all the offspring have yellow seeds.

C. dominant because all of the offspring inherited two alleles for yellow seeds.

D. recessive because all of the offspring inherited two alleles for yellow seeds.

2. Two tall pea plants with yellow seeds and smooth pods are crossed. All of the offspring are tall. Three offspring have smooth pods and one has wrinkled pods. The allele for wrinkled pods

A. must be dominant because the trait does not appear in the parent plants.

B. must be recessive because the trait does not appear in the parent plants.

C. must be dominant because the trait appears in the parent plants.

D. must be recessive because the trait appears in the parent plants.

3. Sickle cell anemia is a deadly, recessive disease. How is sickle cell anemia inherited?

A. For a child to inherit sickle cell anemia, both the child’s mother and father must have and pass down the allele for the disease.

B. For a child to inherit sickle cell anemia, only the child’s mother needs to have and pass down the allele for the disease.

C. For a child to inherit sickle cell anemia, only the child’s father needs to have and pass down the allele for the disease.

D. For a child to inherit sickle cell anemia, both the child’s mother and father must have the disease.

4. Huntington’s disease is an incurable, progressive nerve disorder. Symptoms of the disease generally appear between the ages of 30 and 50. The allele for Huntington’s disease is dominant. Is it possible for a child born to a parent with Huntington’s disease to not develop the disease later in life?

A. No, it is not possible because the recessive allele will hide the dominant allele.

B. No, it is not possible because the dominant allele will hide the recessive allele.

C. Yes, it is possible if the parent with the disease passes down a dominant allele.

D. Yes, it is possible if the parent with the disease passes down a recessive allele.

5. Which of the following explains the relationship between genes and chromosomes?

A. Chromosomes come in different versions called genes.

B. Genes come in different versions called chromosomes.

C.
Chromosomes are structures that are made up of two versions of multiple genes.

D. Genes are structures that are made up of multiple chromosomes.

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