Inheritance

1. Gregor Mendel worked with pea plants because they are easy to grow, and they have many traits that distinguish strains of pea plants from each other. Mendel believed that the characteristics of pea plants are determined by the:

• inheritance of units or factors from both parents

• inheritance of units or factors from one parent

• relative health of the parent plants at the time of pollination

2. An allele is:

• a heterozygous genotype

• a homozygous genotype

• one of several possible forms of a gene

3. Purple flowers are dominant to white flowers. If you cross homozygous plants, which phenotypes might be present between parents and offspring?

• AA Purple

  Aa Purple

  aa White

• AA Purple

  Aa White

  aa White

• AA homozygous

  Aa heterozygous

  aa homozygous

4. Round seeds (RR) are dominant to wrinkled seeds (rr) in pea plants. Cross a homozygous round seeded with a wrinkled seed pea plant. What percentage in F-1 will be round seeds? What are the offspring genotypes?

• 100% Rr

• 50% Rr

  50% RR

• 0% Rr

  100% RR

5. The statment

"During gamete formation the alleles for each gene separate from each other so that each gamete carries only one allele for each gene."

describes the law of:

• segregation

• independent assortment

• dominance

6. The statment

"There are separate genes for separate traits and characters and they influence and sort themselves independently of the other genes."

describes the law of:

• segregation

• independent assortment

• dominance

7. The statment

"When parents with pure, contrasting traits are crossed together, only one form of trait appears in the next generation. The hybrid offsprings will exhibit only the dominant trait in the phenotype."

describes the law of:

• segregation

• independent assortment

• dominance

8. Suppose a white-furred rabbit breeds with a black-furred rabbit and all of their offspring have a phenotype of gray fur. What does the gene for fur color in rabbits appear to be an example of?

• Codominance

• Incomplete dominance

• Multiple Alleles

9. In the ABO blood group system in humans, if a person of type-B blood has children with a person of type-AB blood, what blood types could their children have?

• Type-AB, type-A, and type-B

• Type-B and type-AB

• Type-AB, type-A, type-B, and type-O

10. A gene for corn has two alleles, one for yellow kernels and one for white kernels. Cross pollination of yellow corn and white corn results in ears of corn that have an approximately even mix of yellow and white kernels. Which term best describes the relationship between the two alleles?

• Codominance

• Incomplete dominance

• Multiple Alleles