Question 1

Which of the following best describes the concept of a 'model organism' as used by Mendel in his experiments with garden peas?

Accepted Answer

A species used for research that is practical to work with and whose findings can be generalized to other species.

Question 2

Mendel’s principle of segregation is best explained by which cellular process?

Accepted Answer

Separation of homologous chromosomes during meiosis I

Question 3

Which of the following statements about Mendel’s experimental system is FALSE?

Accepted Answer

Mendel’s pea plants had only one phenotype for each trait.

Question 4

If a pea plant with genotype $$Rr ($$round seeds) is self-fertilized, what is the expected phenotypic ratio of round to wrinkled seeds in the offspring?

Accepted Answer

$$3:1$$

Question 5

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

Accepted Answer

Genotype refers to the alleles present in an individual, while phenotype refers to the observable traits.

Question 6

Which hypothesis did Mendel’s experiments with pea plants directly contradict?

Accepted Answer

The blending inheritance hypothesis

Question 7

A cross between two pure lines, one with round seeds ($$RR) $$and one with wrinkled seeds ($$rr$$), produces all $$Rr$$ offspring. If these $$Rr$$ plants are self-fertilized, what fraction of the F2 generation will be homozygous recessive?

Accepted Answer

$$1/4$$

Question 8

Which of the following is NOT a reason Mendel chose garden peas for his experiments?

Accepted Answer

They have a long generation time.

Question 9

What is the definition of a 'pure line' in Mendelian genetics?

Accepted Answer

Individuals identical in phenotype that, when crossed, produce offspring all with the same phenotype.

Question 10

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

Accepted Answer

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

Question 11

In Mendel’s experiments, what was the result when he crossed two plants that differed in two traits (dihybrid cross) and allowed the F1 generation to self-fertilize?

Accepted Answer

A phenotypic ratio of $$9:3:3:1 in $$the F2 generation.

Question 12

Which of the following terms refers to having two different alleles for a gene?

Accepted Answer

Heterozygous

Question 13

Which statement about dominant and recessive alleles is correct?

Accepted Answer

A recessive allele produces its phenotype only in homozygous individuals.

Question 14

Why was it important that Mendel used traits with only two distinct phenotypes in his experiments?

Accepted Answer

It allowed him to easily observe and categorize the results of crosses.

Question 15

Which of the following best explains why Mendel’s results were reproducible and reliable?

Accepted Answer

He used large sample sizes, controlled matings, and repeated his experiments.

Chapter 14: Mendel and the Gene – Principles of Inheritance

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