Question 1

Which of the following best describes incomplete dominance as observed in snapdragon flower color inheritance?

Accepted Answer

The heterozygote displays a phenotype intermediate between the two homozygotes.

Question 2

A man with type AB blood marries a woman with type O blood. What blood types would you expect in their children?

Accepted Answer

Type A and type B only

Question 3

Which of the following is an example of pleiotropy?

Accepted Answer

A single gene affecting both the color and texture of a pea plant's seed coat

Question 4

In the ABO blood group system, which genotype(s) would result in type O blood?

Accepted Answer

$$ii$$

Question 5

Which of the following best explains why Tay-Sachs disease is considered recessive at the organismal level but not at the biochemical level?

Accepted Answer

Heterozygotes produce enough enzyme to prevent symptoms, but enzyme activity is intermediate between homozygotes.

Question 6

Which of the following is an example of codominance?

Accepted Answer

A flower with red and white patches due to both alleles being expressed

Question 7

A cross between two black Labrador retrievers produces offspring with black, brown, and yellow coats. Which genetic principle does this illustrate?

Accepted Answer

Epistasis

Question 8

If a trait is controlled by three independently assorting genes, each with a dominant and recessive allele, how many possible genotypes can result in the darkest phenotype (all dominant alleles)?

Accepted Answer

$$1$$

Question 9

Which of the following best describes the concept of polygenic inheritance?

Accepted Answer

Multiple genes independently affect a single trait, resulting in continuous variation.

Question 10

Which of the following scenarios best illustrates environmental influence on phenotype?

Accepted Answer

Hydrangea flowers changing color depending on soil pH

Question 11

A cross between a gray rooster and a black hen produces offspring with gray, black, and white feathers. Which inheritance pattern is most likely responsible?

Accepted Answer

Polygenic inheritance

Question 12

Which of the following is NOT a characteristic of Mendelian inheritance?

Accepted Answer

A single gene can have multiple phenotypic effects

Question 13

Which of the following best describes the relationship between genotype and phenotype in cases of complete dominance?

Accepted Answer

The dominant allele completely masks the recessive allele in the heterozygote

Question 14

Which of the following is an example of a trait influenced by multiple alleles?

Accepted Answer

ABO blood group system

Question 15

Which of the following best explains why dominant alleles are not necessarily more common in a population than recessive alleles?

Accepted Answer

Dominance does not determine allele frequency; evolutionary forces such as selection, mutation, and genetic drift do.

Question 16

Which of the following best describes the effect of epistasis?

Accepted Answer

One gene alters or masks the expression of another gene

Question 17

Which of the following is a correct prediction for the offspring of a cross between two heterozygous snapdragons (pink flowers) for flower color?

Accepted Answer

1 red : 2 pink : 1 white

Question 18

Which of the following best describes phenotypic plasticity?

Accepted Answer

The ability of a genotype to produce different phenotypes under different environmental conditions

Question 19

Which of the following is a real-world example of a human trait influenced by polygenic inheritance?

Accepted Answer

Skin color

11.3

Study Guide - Practice Questions

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