Q: In a cross between two heterozygous tall pea plants (Tt), what is the expected genotypic ratio among the offspring?

$$1 \ \text{TT} : 2 \ \text{Tt} : 1 \ \text{tt}$$

Question 1

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

Accepted Answer

Each parent contributes only one allele for each gene to their offspring, and these alleles separate during gamete formation.

Question 2

In Mendel's pea plant experiments, if a true-breeding purple-flowered plant (PP) is crossed with a true-breeding white-flowered plant (pp), what will be the genotype and phenotype of the F1 generation?

Accepted Answer

Genotype: Pp; Phenotype: All purple flowers

Question 3

A heterozygous purple-flowered pea plant (Pp) is self-fertilized. What is the expected phenotypic ratio of purple to white flowers in the F2 generation?

Accepted Answer

$$3:1$$

Question 4

Which of the following best explains the Law of Independent Assortment?

Accepted Answer

Alleles of different genes assort independently of one another during gamete formation.

Question 5

If a pea plant with genotype YyRr is crossed with another YyRr plant, what is the expected phenotypic ratio for the offspring according to Mendel's dihybrid cross?

Accepted Answer

$$9:3:3:1$$

Question 6

Which of the following is an example of a binary characteristic as studied by Mendel?

Accepted Answer

Flower color: purple vs. white

Question 7

A plant with genotype PpYy is crossed with a plant with genotype ppyy. What fraction of the offspring will have purple flowers and yellow seeds? (Assume P = purple, p = white, Y = yellow, y = green)

Accepted Answer

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

Question 8

Which statement about true-breeding plants is correct?

Accepted Answer

They produce offspring with the same trait as the parent for many generations.

Question 9

In a cross between two heterozygous tall pea plants (Tt), what is the expected genotypic ratio among the offspring?

Accepted Answer

$$1 \ 	ext{TT} : 2 \ 	ext{Tt} : 1 \ 	ext{tt}$$

Question 10

Which of the following best describes a phenotype?

Accepted Answer

The observable physical or physiological trait of an organism

Question 11

A pea plant with genotype RrYy is test-crossed with a plant with genotype rryy. What proportion of the offspring will have round, yellow seeds? (R = round, r = wrinkled, Y = yellow, y = green)

Accepted Answer

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

Question 12

Which of the following is NOT one of the seven characteristics Mendel studied in pea plants?

Accepted Answer

Leaf shape

Question 13

If a plant is homozygous for a recessive trait, which of the following genotypes is correct?

Accepted Answer

pp

Question 14

Which of the following best explains why Mendel's work was initially ignored by the scientific community?

Accepted Answer

The significance of his quantitative approach and the concept of genes were not understood at the time.

Question 15

A plant with genotype YYRR is crossed with a plant with genotype yyrr. What is the genotype of all F1 offspring?

Accepted Answer

YyRr

Question 16

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

Accepted Answer

Pp

Question 17

In a dihybrid cross, what is the probability of obtaining an offspring with both recessive traits if both parents are heterozygous for both genes (YyRr x YyRr)?

Accepted Answer

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

Question 18

Which of the following best describes the difference between a characteristic and a trait in Mendelian genetics?

Accepted Answer

A characteristic is a heritable feature, while a trait is the specific form that feature takes.

Question 19

If a 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 20

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

Accepted Answer

Pea plants have easily distinguishable traits and can be easily cross-pollinated or self-pollinated.

Mendelian Genetics: Principles of Heredity and Experimental Foundations

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