Question 1

Which of the following best explains why Pisum sativum (pea plants) were an ideal organism for Mendel's genetic experiments?

Accepted Answer

They have a short generation time, distinct traits, and can self-fertilize or be cross-fertilized easily.

Question 2

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

Accepted Answer

Leaf shape

Question 3

According to Mendel's Law of Segregation, what happens during gamete formation?

Accepted Answer

Each gamete receives only one allele from each gene pair.

Question 4

A cross between two heterozygous tall pea plants (Tt x Tt) results in which genotypic ratio in the offspring?

Accepted Answer

$$1 \; TT : 2 \; Tt : 1 \; tt$$

Question 5

In a monohybrid cross, what is the expected phenotypic ratio in the F2 generation if the dominant allele is completely dominant over the recessive?

Accepted Answer

$$3:1$$

Question 6

Which historical theory proposed that a miniature human (homunculus) existed inside gametes?

Accepted Answer

Preformationism

Question 7

What is the main difference between Mendel’s Law of Segregation and Law of Independent Assortment?

Accepted Answer

Segregation refers to separation of alleles for one gene; independent assortment refers to separation of alleles for two or more genes.

Question 8

A testcross is performed between a plant with an unknown genotype showing the dominant phenotype and a homozygous recessive plant. If the unknown plant is heterozygous, what proportion of the offspring will show the recessive phenotype?

Accepted Answer

$$\frac{1}{2}$$

Question 9

In a dihybrid cross between two plants heterozygous for both seed shape (R = round, r = wrinkled) and seed color (Y = yellow, y = green), what is the expected phenotypic ratio in the F2 generation?

Accepted Answer

$$9:3:3:1$$

Question 10

Which of the following statements about Mendel’s experiments is TRUE?

Accepted Answer

He kept detailed quantitative and qualitative records of his crosses.

Question 11

If a cat with genotype Hh (short hair, H is dominant) is crossed with a cat with genotype hh (long hair), what is the expected genotypic ratio of the offspring?

Accepted Answer

$$1 \; Hh : 1 \; hh$$

Question 12

Which of the following best describes a homozygous genotype?

Accepted Answer

An organism with two identical alleles for a gene.

Question 13

Which scientist’s work disproved the theory of spontaneous generation?

Accepted Answer

Louis Pasteur

Question 14

A plant with genotype TtYy is crossed with a plant with genotype ttyy. If the genes assort independently, what proportion of the offspring will be tall with yellow seeds?

Accepted Answer

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

Question 15

Which of the following is a real-world application of Mendel’s Law of Independent Assortment?

Accepted Answer

Predicting the inheritance of two unlinked genetic diseases in humans.

Question 16

If a dihybrid cross yields 16 offspring, how many are expected to show both recessive phenotypes according to Mendelian ratios?

Accepted Answer

1

Question 17

Which of the following best describes the concept of a phenotype?

Accepted Answer

The observable characteristics of an organism.

Question 18

Which method is most efficient for predicting the outcome of a trihybrid cross?

Accepted Answer

Multiplication or forked-line method

Question 19

Which of the following is a correct statement about Mendel’s reciprocal crosses?

Accepted Answer

They showed that inheritance patterns were not dependent on which parent contributed which trait.

Mendelian Genetics: Foundations, Experiments, and Laws

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