Question 1

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

Accepted Answer

Each organism has two alleles for each gene, which segregate randomly into gametes so that each gamete receives only one allele.

Question 2

A pea plant with genotype $$SsYy is $$self-fertilized. According to Mendel’s Law of Independent Assortment, what is the probability of obtaining an offspring with genotype $$ssyy$$?

Accepted Answer

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

Question 3

Which of the following is a real-world example that contradicts the theory of blending inheritance?

Accepted Answer

A pea plant with round seeds crossed with a wrinkled seed plant produces all round seeds in the F1 generation.

Question 4

In a testcross, a plant with the dominant phenotype but unknown genotype is crossed with a homozygous recessive plant. If the unknown plant is heterozygous, what phenotypic ratio is expected in the offspring?

Accepted Answer

1:1 ratio of dominant to recessive phenotypes.

Question 5

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

Accepted Answer

They naturally self-fertilize and have easily distinguishable, discontinuous traits.

Question 6

A cross between two true-breeding pea plants, one with round yellow seeds ($$RRYY) $$and one with wrinkled green seeds ($$rryy$$), produces F1 offspring. What is the genotype of the F1 generation?

Accepted Answer

$$RrYy$$

Question 7

If a plant with genotype $$Aa is $$self-fertilized, what is the expected genotypic ratio among the F2 offspring?

Accepted Answer

1 AA : 2 Aa : 1 aa

Question 8

Which of the following statements about Mendel’s experimental methods is correct?

Accepted Answer

He counted and recorded the number of offspring for each phenotype.

Question 9

In a dihybrid cross ($$SsYy 	imes SsYy$$), what is the expected phenotypic ratio in the F2 generation if the two genes assort independently?

Accepted Answer

9:3:3:1

Question 10

A researcher observes a 3:1 ratio of yellow to white kernels in the F2 generation of a corn cross. Which genetic principle does this observation support?

Accepted Answer

Law of Segregation

Question 11

Which of the following is the best definition of a phenotype?

Accepted Answer

The observable traits or characteristics of an organism.

Question 12

A plant with genotype $$Rr is $$crossed with a plant with genotype $$rr. $$What proportion of the offspring are expected to have the recessive phenotype?

Accepted Answer

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

Question 13

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

Accepted Answer

Genotype is the genetic makeup, phenotype is the observable trait.

Question 14

In a trihybrid cross ($$AaBbCc 	imes AaBbCc$$), what is the probability of obtaining an offspring with genotype $$aabbcc$$?

Accepted Answer

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

Question 15

Which of the following is a key reason Mendel’s work was not immediately recognized by the scientific community?

Accepted Answer

He published in an obscure journal and his work was not widely circulated.

Question 16

A population geneticist is studying human height, a continuously variable trait. Which genetic approach is most appropriate for this study?

Accepted Answer

Quantitative genetics

Question 17

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

Accepted Answer

Each gene pair segregates independently during gamete formation.

Question 18

A scientist performs a chi-square test on the results of a genetic cross and finds a significant difference between observed and expected ratios. What is the most reasonable conclusion?

Accepted Answer

The model of inheritance may not be correct for this trait.

Question 19

Which of the following is NOT a feature of Mendel’s experimental design?

Accepted Answer

He studied traits controlled by multiple genes with linkage.

Question 20

If a plant with genotype $$SsYy is $$crossed with a plant with genotype $$ssyy$$, what proportion of the offspring are expected to have the genotype $$SsYy$$?

Accepted Answer

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

Mendelian Genetics: Principles of Heredity and Transmission

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