Question 1

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

Accepted Answer

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

Question 2

In Mendel’s pea plant experiments, what was the observed phenotypic ratio in the F2 generation of a monohybrid cross?

Accepted Answer

$3:1$

Question 3

Which statement correctly distinguishes genotype from phenotype?

Accepted Answer

Genotype refers to the genetic makeup, while phenotype refers to the observable traits.

Question 4

A pea plant with genotype $Pp$ is crossed with a plant with genotype $pp$. What is the expected ratio of purple to white flowers in the offspring?

Accepted Answer

$1:1$

Question 5

Which of the following scenarios best illustrates Mendel’s Law of Independent Assortment?

Accepted Answer

Alleles for flower color and seed shape segregate independently during gamete formation.

Question 6

If a testcross is performed between a plant with unknown genotype for purple flowers and a homozygous recessive plant, and half the offspring have white flowers, what is the genotype of the unknown parent?

Accepted Answer

Heterozygous ($Pp$)

Question 7

Which of the following best explains why Mendel chose pea plants for his experiments?

Accepted Answer

Pea plants have easily observable traits and are usually self-pollinating.

Question 8

What is the expected genotypic ratio in the F2 generation of a monohybrid cross ($Pp 	imes Pp$)?

Accepted Answer

$1:2:1$ (PP:Pp:pp)

Question 9

A plant with genotype $Pp$ produces an enzyme that synthesizes purple pigment. What would be the phenotype of a plant with genotype $pp$?

Accepted Answer

White flowers

Question 10

During gamete formation, what process ensures that alleles for a trait separate so that each gamete receives only one allele?

Accepted Answer

Segregation during meiosis

Question 11

If two genes are located on different chromosomes, what is the probability that their alleles will assort independently during gamete formation?

Accepted Answer

100%

Question 12

Which of the following is a direct result of the Law of Segregation?

Accepted Answer

Each gamete receives only one allele for each gene.

Question 13

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

Accepted Answer

Cross with a homozygous recessive organism

Question 14

Which of the following best describes a dominant trait?

Accepted Answer

A trait that masks the effect of a recessive allele when both are present.

Question 15

In a dihybrid cross ($YyRr 	imes YyRr$), what is the expected phenotypic ratio according to Mendel’s Law of Independent Assortment?

Accepted Answer

$9:3:3:1$

Question 16

Which of the following is NOT a reason Mendel’s experiments were successful?

Accepted Answer

He chose plants that were difficult to breed.

Question 17

If a plant with genotype $Pp$ self-pollinates, what fraction of the offspring will be homozygous recessive?

Accepted Answer

$1/4$

Question 18

Which process during meiosis is responsible for the independent assortment of genes?

Accepted Answer

Alignment of homologous chromosomes at metaphase I

Question 19

Why do recessive traits sometimes reappear in the F2 generation after being absent in the F1 generation?

Accepted Answer

Recessive alleles are masked by dominant alleles in the F1 generation but can pair together in the F2 generation.

Mendelian Inheritance: Principles and Applications

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