Question 1

Which of the following best describes Mendel's law of segregation?

Accepted Answer

Alleles for a gene separate from each other during gamete formation, so each gamete carries only one allele for each gene.

Question 2

In Mendel’s pea plant experiments, what was the genotype of the F1 generation when a true-breeding purple-flowered plant (PP) was crossed with a true-breeding white-flowered plant (pp)?

Accepted Answer

$$Pp$$

Question 3

Which of the following is an example of a phenotype?

Accepted Answer

Purple flowers

Question 4

If two heterozygous tall pea plants ($$Tt) $$are crossed, what is the expected phenotypic ratio of tall to short plants in the F2 generation?

Accepted Answer

$$3:1$$

Question 5

Which statement about alleles is correct?

Accepted Answer

Alleles are different versions of a gene that can produce variations in a trait.

Question 6

A carrier for a recessive genetic disorder has which genotype?

Accepted Answer

Heterozygous ($$Aa)$$

Question 7

Which of the following best explains the law of independent assortment?

Accepted Answer

Alleles of different genes segregate independently during gamete formation.

Question 8

In a dihybrid cross between two $$AaBb$$ individuals, what is the probability of obtaining an offspring with genotype $$aabb$$?

Accepted Answer

$$\frac{1}{16}$$

Question 9

Which genetic testing method involves fertilizing an egg with sperm outside the body and testing the embryo before implantation?

Accepted Answer

Preimplantation genetic testing

Question 10

A plant with genotype $$Pp is $$crossed with a plant with genotype $$pp. $$What percentage of the offspring will have purple flowers if purple is dominant?

Accepted Answer

$$50\%$$

Question 11

Which of the following is NOT a benefit of using garden peas as a model organism in genetics?

Accepted Answer

They have a long generation time.

Question 12

Which scenario best illustrates incomplete dominance?

Accepted Answer

A cross between red and white flowers produces pink flowers.

Question 13

If a person with type A blood and a person with type B blood have children, which blood type is NOT possible among their offspring?

Accepted Answer

Type C

Question 14

Which of the following best describes codominance?

Accepted Answer

Both alleles in a heterozygote are fully expressed, affecting the phenotype in separate ways.

Question 15

What is the probability of obtaining a genotype $$AaBb$$ from a cross between two $$AaBb$$ individuals?

Accepted Answer

$$\frac{1}{4}$$

Question 16

Which term describes an organism with two identical alleles for a gene?

Accepted Answer

Homozygous

Question 17

Which of the following is an example of a polygenic trait?

Accepted Answer

Human skin color

Question 18

A true-breeding tall pea plant is crossed with a true-breeding short pea plant. What will be the genotype and phenotype of the F1 generation?

Accepted Answer

Genotype: $$Tt$$, Phenotype: Tall

Question 19

Which of the following is true about dominant and recessive alleles?

Accepted Answer

A dominant allele masks the effect of a recessive allele in a heterozygote.

Question 20

If the probability of inheriting allele A is $$\frac{1}{2}$$ and the probability of inheriting allele B is $$\frac{1}{2}$$, what is the probability of inheriting both alleles together?

Accepted Answer

$$\frac{1}{4}$$

Mendel and Genes: Foundations of Classical Genetics

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