Question 1

Which of the following best explains why Mendel chose the garden pea as his model organism for genetic experiments?

Accepted Answer

Peas produce large numbers of seeds, have a short generation time, and allow controlled matings.

Question 2

Mendel’s principle of segregation states that:

Accepted Answer

Two members of each gene pair segregate into different gametes during egg and sperm formation.

Question 3

A testcross is used to determine the genotype of a parent with a dominant phenotype. Which cross would you perform?

Accepted Answer

Cross the dominant parent with a parent that is homozygous recessive.

Question 4

In a dihybrid cross between two heterozygotes for seed shape (Rr) and seed color (Yy), what is the expected phenotypic ratio in the F2 generation according to Mendel’s principle of independent assortment?

Accepted Answer

$$9:3:3:1$$

Question 5

Which of the following scenarios best illustrates the concept of incomplete dominance?

Accepted Answer

A cross between red-flowered and white-flowered plants produces pink-flowered offspring.

Question 6

Which of the following best describes codominance, as seen in human ABO blood types?

Accepted Answer

Both alleles are fully expressed in the heterozygote.

Question 7

If two genes are located close together on the same chromosome, which of the following is most likely true?

Accepted Answer

They are likely to be inherited together due to genetic linkage.

Question 8

A woman with blood type AB and a man with blood type O have children. Which blood types are possible for their children?

Accepted Answer

A and B

Question 9

Which of the following best explains why quantitative traits, such as human height, often show a bell-shaped curve in populations?

Accepted Answer

They are influenced by many genes and environmental factors.

Question 10

A pedigree shows a trait that appears in every generation and affects both males and females equally. Which mode of inheritance is most likely?

Accepted Answer

Autosomal dominant

Question 11

Which of the following statements about the role of crossing over in genetic mapping is correct?

Accepted Answer

The percentage of recombinant offspring can be used to estimate the distance between genes.

Question 12

A man with an X-linked recessive disorder and a woman who is a carrier have a child. What is the probability that their son will have the disorder?

Accepted Answer

$$0.25$$

Question 13

Which of the following is an example of a trait that does NOT follow Mendel’s rules of inheritance?

Accepted Answer

ABO blood type in humans

Question 14

If a trait is X-linked dominant, which of the following is true?

Accepted Answer

All daughters of an affected male will be affected.

Question 15

Which of the following best describes the principle of independent assortment?

Accepted Answer

Alleles of different genes are transmitted independently of one another during meiosis.

Question 16

A plant with genotype $$RrYy is $$crossed with a plant with genotype $$rryy. $$What proportion of the offspring will have round, yellow seeds if R (round) and Y (yellow) are dominant?

Accepted Answer

$$1/4$$

Question 17

Which of the following is a correct statement about multiple allelism?

Accepted Answer

Multiple allelism means a gene can have more than two alleles in a population.

Question 18

Which of the following best explains why Mendel’s principles cannot fully explain the inheritance of skin color in humans?

Accepted Answer

Skin color is a quantitative trait influenced by many genes and environmental factors.

Question 19

If a gene is located on an autosome and is recessive, which of the following is true about its inheritance pattern?

Accepted Answer

It can skip generations and affect both males and females equally.

Question 20

Which of the following is a real-world example of codominance?

Accepted Answer

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

Mendel and the Gene: Foundations and Extensions of Mendelian Genetics

Study Guide - Practice Questions

Study Guide - Flashcards