Question 1

Which of the following best describes Mendel's Law of Segregation?

Accepted Answer

The two alleles for a heritable character separate during gamete formation, so each gamete receives only one allele.

Question 2

In a monohybrid cross between two heterozygous pea plants (Pp x Pp), what is the expected phenotypic ratio in the F2 generation?

Accepted Answer

$$3:1$$

Question 3

A plant with genotype Pp is crossed with another plant with genotype pp. What percentage of the offspring are expected to have purple flowers, assuming purple (P) is dominant over white (p)?

Accepted Answer

$$50\%$$

Question 4

Which of the following is an example of incomplete dominance?

Accepted Answer

A cross between red and white snapdragons produces pink flowers.

Question 5

If a gene has multiple alleles, which of the following is true?

Accepted Answer

There are more than two possible alleles in the population, but each individual still inherits only two alleles.

Question 6

A man with blood type AB (genotype $$I^A I^B) $$and a woman with blood type O (genotype $$ii) $$have children. What are the possible blood types of their children?

Accepted Answer

A and B only

Question 7

Which of the following best explains the concept of pleiotropy?

Accepted Answer

One gene affects multiple phenotypic traits.

Question 8

In a dihybrid cross between two heterozygous pea plants (YyRr x YyRr), what is the expected phenotypic ratio in the F2 generation?

Accepted Answer

$$9:3:3:1$$

Question 9

A woman who is a carrier for cystic fibrosis (genotype $$Aa) $$and a man who is also a carrier (genotype $$Aa) $$have a child. What is the probability that their child will have cystic fibrosis?

Accepted Answer

$$1/4$$

Question 10

Which of the following is an example of codominance?

Accepted Answer

A person with blood type AB expresses both A and B antigens.

Question 11

What is the genotype of a true-breeding plant with white flowers, if purple (P) is dominant and white (p) is recessive?

Accepted Answer

pp

Question 12

Which of the following best describes the Law of Independent Assortment?

Accepted Answer

Alleles for different genes segregate independently during gamete formation.

Question 13

A woman with normal vision (X$$^NX$^n) $$and a man with colorblindness (X$$^nY) $$have a son. What is the probability that their son will be colorblind?

Accepted Answer

$$1/2$$

Question 14

Which of the following is an example of polygenic inheritance?

Accepted Answer

Human skin color

Question 15

If a trait is controlled by a dominant allele, which of the following is true?

Accepted Answer

The trait will appear if at least one dominant allele is present.

Question 16

A couple has a child with albinism (aa). Neither parent has albinism. What are the genotypes of the parents?

Accepted Answer

Aa and Aa

Question 17

Which of the following best describes epistasis?

Accepted Answer

One gene affects the expression of another gene at a different locus.

Question 18

In humans, how many pairs of autosomes are present in a typical somatic cell?

Accepted Answer

22

Question 19

Which of the following statements about sex-linked inheritance is correct?

Accepted Answer

X-linked recessive traits are more likely to be expressed in males.

Question 20

A genetic counselor is working with a couple, both of whom are carriers for sickle cell disease. What is the probability that their child will be a carrier but not have the disease?

Accepted Answer

$$1/2$$

Mendel and the Gene Idea: Foundations of Classical Genetics

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