Question 1

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

Accepted Answer

Alleles for a heritable character separate during gamete formation and end up in different gametes.

Question 2

A pea plant with genotype Pp is self-fertilized. What is the expected phenotypic ratio of purple to white flowers in the F2 generation?

Accepted Answer

$$3:1$$

Question 3

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 4

Which of the following scenarios would violate Mendel's Law of Independent Assortment?

Accepted Answer

Genes for seed color and seed shape are located very close together on the same chromosome.

Question 5

A test cross is performed between a plant with purple flowers of unknown genotype and a plant with white flowers (pp). If all offspring have purple flowers, what is the genotype of the purple-flowered parent?

Accepted Answer

PP

Question 6

If a plant is heterozygous for two genes (YyRr), what are the possible gametes it can produce, assuming independent assortment?

Accepted Answer

YR, Yr, yR, yr

Question 7

Which of the following statements about alleles is correct?

Accepted Answer

Alleles are different forms of a gene that arise by mutation and are found at the same place on a chromosome.

Question 8

A plant with genotype PpYy is crossed with a plant with genotype ppyy. What proportion of the offspring will have purple flowers and yellow seeds? (Assume independent assortment and complete dominance.)

Accepted Answer

$$1/4$$

Question 9

Which of the following best explains why Mendel's experiments with peas were successful in revealing the basic principles of inheritance?

Accepted Answer

The traits Mendel studied were controlled by single genes with clear dominant and recessive alleles.

Question 10

If two genes are located far apart on the same chromosome, what is the expected outcome regarding their inheritance?

Accepted Answer

They will assort independently due to crossing over.

Question 11

A true-breeding yellow-seeded pea plant (YY) is crossed with a true-breeding green-seeded plant (yy). What will be the genotype and phenotype of the F1 generation?

Accepted Answer

Genotype: Yy; Phenotype: yellow seeds

Question 12

Which of the following is an example of a homozygous genotype?

Accepted Answer

PP

Question 13

In a monohybrid cross, what is the probability of producing an offspring with the recessive phenotype if both parents are heterozygous?

Accepted Answer

$$1/4$$

Question 14

Which of the following best describes the difference between genotype and phenotype?

Accepted Answer

Genotype is the genetic makeup, while phenotype is the observable trait.

Question 15

A plant with genotype YyRr is crossed with a plant with genotype yyrr. What proportion of the offspring will have yellow seeds and round pods? (Assume yellow and round are dominant.)

Accepted Answer

$$1/4$$

Question 16

Which of the following is NOT one of Mendel's four concepts?

Accepted Answer

Alleles segregate independently during gamete formation.

Question 17

If a gene shows complete dominance, what phenotype will be observed in a heterozygote?

Accepted Answer

The dominant phenotype

Question 18

Which of the following best explains why a test cross is used in genetics?

Accepted Answer

To determine whether an individual with a dominant phenotype is homozygous or heterozygous

Question 19

If two genes are linked, which of the following gamete combinations would you expect to be most common from a dihybrid individual (YyRr) with no crossing over?

Accepted Answer

YR and yr

Question 20

Which of the following real-world scenarios best illustrates Mendel's Law of Independent Assortment?

Accepted Answer

A family where eye color and blood type are inherited independently from each other.

Mendelian Genetics: Principles, Laws, and Applications (Chapter 14: 14.1–14.4)

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