Question 1

Which of the following best describes the difference between the blending hypothesis and Mendel's particulate hypothesis of inheritance?

Accepted Answer

The blending hypothesis suggests that genetic material from parents mixes together permanently, while the particulate hypothesis proposes that discrete units are inherited and remain separate.

Question 2

Mendel's Law of Segregation can best be explained by which of the following statements?

Accepted Answer

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

Question 3

A true-breeding pea plant with yellow seeds (dominant trait) is crossed with a true-breeding pea plant with green seeds (recessive trait). What will be the phenotype of the F1 generation?

Accepted Answer

All offspring will have yellow seeds.

Question 4

If two F1 hybrid pea plants (from a cross between true-breeding yellow and green seed plants) are crossed, what is the expected phenotypic ratio in the F2 generation?

Accepted Answer

$$3:1 ($$yellow:green)

Question 5

Which of the following statements about dominant and recessive alleles is correct according to Mendel's third postulate?

Accepted Answer

When two different alleles are present, the dominant allele is expressed and the recessive allele is masked.

Question 6

A geneticist is studying a trait controlled by a single gene with two alleles. If an individual inherits one allele from each parent, which of Mendel's postulates does this illustrate?

Accepted Answer

Second postulate: Each individual inherits two alleles, one from each parent.

Question 7

Which of the following best explains why recessive traits can reappear in the F2 generation after being hidden in the F1 generation?

Accepted Answer

Alleles segregate during gamete formation, allowing recessive alleles to pair together in some offspring.

Question 8

In a real-world scenario, a genetic counselor explains to parents that their child has inherited one allele for a genetic disorder from each parent. Which Mendelian concept does this scenario best illustrate?

Accepted Answer

Each parent contributes one allele for each gene to their offspring.

Question 9

Which of the following equations represents the probability of obtaining a homozygous recessive offspring from a cross between two heterozygous parents (Aa x Aa)?

Accepted Answer

$$P(aa) = 0.25$$

Question 10

Which of the following best describes a 'character' as used in Mendel's experiments?

Accepted Answer

An inheritable feature, such as flower color or seed shape.

Question 11

A plant breeder wants to produce only plants with purple flowers. If purple is dominant to white, which parental cross should she use to guarantee all offspring have purple flowers?

Accepted Answer

Cross two true-breeding purple-flowered plants.

Question 12

Which of the following statements is NOT consistent with Mendel's findings?

Accepted Answer

Traits are always blended in the offspring, resulting in intermediate phenotypes.

Question 13

In a medical case, a child is diagnosed with a recessive genetic disorder, but neither parent shows symptoms. What is the most likely genotype of the parents?

Accepted Answer

Both parents are heterozygous carriers.

Question 14

Which of the following best describes the term 'hybridization' as used in Mendel's experiments?

Accepted Answer

The crossing of two true-breeding parents with different traits.

Question 15

If a plant with genotype $$Aa is $$self-fertilized, what is the expected genotypic ratio among the offspring?

Accepted Answer

$$1\;AA : 2\;Aa : 1\;aa$$

Question 16

Which of the following real-world examples best illustrates Mendel's law of segregation?

Accepted Answer

A child inherits blue eyes from one parent and brown eyes from the other, but only one eye color is expressed.

Question 17

Which of the following is a critical strength of Mendel's experimental approach?

Accepted Answer

He used a quantitative approach, collecting numerical data to support his hypotheses.

Question 18

Which of the following best explains why Mendel's 'heritable factors' are now called genes?

Accepted Answer

They are units of inheritance that determine specific traits.

Question 19

A scientist observes that when two heterozygous animals are crossed, the offspring show a 3:1 ratio of normal to abnormal traits. Which Mendelian principle does this observation support?

Accepted Answer

The law of segregation.

Question 20

Which of the following best describes a 'trait' in Mendel's experiments?

Accepted Answer

A specific variant of a character, such as white flowers.

Mendel and the Gene Idea: Foundations of Genetics

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