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 a 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 man with blood type AB (genotype $$I^A I^B) $$has a child with a woman with blood type O (genotype $$ii$$), what are the possible blood types of their children?

Accepted Answer

A and B only

Question 6

Which of the following best explains the concept of pleiotropy?

Accepted Answer

One gene affects multiple phenotypic traits.

Question 7

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

Accepted Answer

$$1/4$$

Question 8

Which of the following is true about the Law of Independent Assortment?

Accepted Answer

It states that alleles of different genes assort independently during gamete formation.

Question 9

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

Accepted Answer

$$9:3:3:1$$

Question 10

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

Accepted Answer

$$1/2$$

Question 11

Which of the following best describes a homozygous genotype?

Accepted Answer

Having two identical alleles for a gene

Question 12

What is the expected genotypic ratio for the offspring of a monohybrid cross between two heterozygous individuals ($$Pp 	imes Pp$$)?

Accepted Answer

$$1:2:1$$

Question 13

Which of the following is an example of codominance?

Accepted Answer

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

Question 14

A gene's specific position along a chromosome is called its:

Accepted Answer

Locus

Question 15

Which of the following is NOT a reason Mendel chose pea plants for his experiments?

Accepted Answer

They have a long generation time.

Question 16

Which of the following best describes polygenic inheritance?

Accepted Answer

Multiple genes contribute additively to a single trait.

Question 17

If a trait is determined by a dominant allele, which of the following genotypes will express the dominant phenotype?

Accepted Answer

Both homozygous dominant and heterozygous

Question 18

Which of the following is an example of a recessively inherited disorder?

Accepted Answer

Cystic fibrosis

Question 19

A couple, both carriers for albinism (Aa), have two children. What is the probability that both children will have normal pigmentation?

Accepted Answer

$$9/16$$

Question 20

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

Accepted Answer

Males are more likely to express X-linked recessive traits.

Mendel and the Gene Idea: Foundations of Classical Genetics

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