Question 1

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

Accepted Answer

The two copies of a gene segregate from each other during gamete formation, so each gamete carries only one allele.

Question 2

A pea plant with genotype TtYy is self-fertilized. What is the probability that an offspring will be short with green seeds? (T = tall, t = short, Y = yellow, y = green)

Accepted Answer

1/16

Question 3

Which experimental result provided evidence against the blending hypothesis of inheritance?

Accepted Answer

The F1 generation from a cross between purple and white pea flowers all had purple flowers.

Question 4

In Morgan's experiment with fruit flies, why were there no white-eyed females in the F2 generation when a white-eyed male was crossed with a true-breeding red-eyed female?

Accepted Answer

Females must inherit two copies of the white-eye allele (one from each parent), but the F1 females are all heterozygous.

Question 5

A testcross is performed between a white-eyed male fruit fly (X-w Y) and a red-eyed female from the F1 generation (X-w+ X-w). What proportion of the offspring are expected to be white-eyed females?

Accepted Answer

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

Question 6

Which of the following best explains the 9:3:3:1 phenotypic ratio observed in Mendel's dihybrid crosses?

Accepted Answer

Each gene segregates independently during gamete formation, resulting in four possible phenotypic combinations.

Question 7

If a plant with genotype RrYy (R = round, r = wrinkled, Y = yellow, y = green) is testcrossed with a plant that is rryy, what proportion of the offspring are expected to be round and yellow?

Accepted Answer

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

Question 8

Which of the following is NOT a fundamental principle of the chromosome theory of inheritance?

Accepted Answer

Genes are blended together during fertilization.

Question 9

A heterozygous pea plant (Tt) is crossed with a homozygous recessive plant (tt). What is the expected genotypic ratio among the offspring?

Accepted Answer

1 Tt : 1 tt

Question 10

Which of the following scenarios demonstrates genetic recombination as described in Mendel's experiments?

Accepted Answer

An offspring pea plant has a combination of round green seeds, while both parents had round yellow and wrinkled green seeds.

Question 11

Which method is most efficient for predicting the phenotypic ratios of offspring in a cross involving three independently assorting genes?

Accepted Answer

Forked-line method

Question 12

In a cross between two heterozygous plants for three traits (TtRrYy x TtRrYy), what is the probability of obtaining an offspring that is homozygous recessive for all three traits?

Accepted Answer

$$\frac{1}{64}$$

Question 13

Which of the following best explains why the law of independent assortment does not always apply to all genes?

Accepted Answer

Some genes are located close together on the same chromosome and tend to be inherited together.

Question 14

A true-breeding tall, round, yellow pea plant (genotype TTRRYY) is crossed with a true-breeding short, wrinkled, green plant (genotype ttrryy). What is the genotype of the F1 generation?

Accepted Answer

TtRrYy

Question 15

Which of the following best describes the relationship between Mendel's laws and chromosome behavior during meiosis?

Accepted Answer

The law of segregation is explained by the separation of homologous chromosomes during meiosis I.

Question 16

In Morgan's experiment, what result from the testcross confirmed that the white-eye allele is X-linked?

Accepted Answer

White-eyed females appeared only in the testcross, not in the F2 generation, indicating the allele is on the X chromosome.

Question 17

Which of the following is an example of a genotype?

Accepted Answer

Tt

Question 18

If a heterozygous female fruit fly (X-w+ X-w) is crossed with a white-eyed male (X-w Y), what is the expected ratio of white-eyed to red-eyed offspring?

Accepted Answer

1:1

Question 19

Which of the following best describes the concept of 'hybridization' as used by Mendel?

Accepted Answer

Breeding between two individuals with different characteristics to produce offspring with mixed traits.

Question 20

Which of the following is a phenotype?

Accepted Answer

Axial flower position

Mendelian Inheritance: Principles, Experiments, and Chromosome Theory

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