Question 1

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

Accepted Answer

Paired hereditary factors separate randomly so that each gamete receives one factor.

Question 2

A pea plant with genotype $$Yy ($$yellow seed color) is self-fertilized. What is the expected phenotypic ratio in the F2 generation?

Accepted Answer

$$3:1$$ yellow to green

Question 3

Which of the following is NOT a reason why Mendel chose pea plants for his experiments?

Accepted Answer

They have only one observable trait.

Question 4

In a dihybrid cross between two $$RrYy$$ pea plants (where $$R = $$round, $$r = $$wrinkled, $$Y = $$yellow, $$y = $$green), what is the probability of obtaining an offspring with round, yellow seeds?

Accepted Answer

$$9/16$$

Question 5

A testcross is performed between a plant with an unknown genotype showing a dominant phenotype and a homozygous recessive plant. If the unknown plant is heterozygous, what phenotypic ratio is expected in the offspring?

Accepted Answer

$$1:1$$ dominant to recessive

Question 6

Which of the following best explains the product law in genetics?

Accepted Answer

The probability of two independent events occurring together is the product of their individual probabilities.

Question 7

A couple, both heterozygous for the recessive disease congenital analgesia ($$Pp$$), plan to have three children. What is the probability that all three children will have the disease?

Accepted Answer

$$1/64$$

Question 8

Which of the following statements about dominant and recessive inheritance patterns in pedigrees is correct?

Accepted Answer

Recessive traits can skip generations, while dominant traits usually appear in every generation.

Question 9

If two heterozygous mice ($$DdCc) $$are crossed, what is the probability that an offspring will have either normal ears and a normal tail OR droopy ears and a crinkly tail?

Accepted Answer

$$10/16$$

Question 10

Which of the following is a modern model genetic organism used for studying genetics?

Accepted Answer

Saccharomyces cerevisiae (brewer's yeast)

Question 11

In Mendel’s experiments, what was the outcome when he performed reciprocal crosses between tall and dwarf pea plants?

Accepted Answer

The F1 and F2 patterns of inheritance were similar regardless of which parent was tall or dwarf.

Question 12

Which of the following best describes a genotype?

Accepted Answer

The specific allelic composition of an individual

Question 13

A plant with genotype $$SsYy is $$testcrossed with $$ssyy. $$What proportion of the offspring are expected to have the genotype $$SsYy$$?

Accepted Answer

$$1/4$$

Question 14

Which of the following is a key feature of Mendel’s empirical approach to genetics?

Accepted Answer

He used quantitative analysis to identify mathematical relationships in inheritance.

Question 15

Which of the following is an example of a recessive human genetic disease?

Accepted Answer

Cystic fibrosis

Question 16

If a plant is homozygous for the dominant allele ($$RR) $$and is crossed with a plant that is homozygous for the recessive allele ($$rr$$), what will be the genotype of all F1 offspring?

Accepted Answer

$$Rr$$

Question 17

Which of the following best describes the sum rule in probability as applied to genetics?

Accepted Answer

The probability that one of two or more mutually exclusive events will occur is the sum of their respective probabilities.

Question 18

Which of the following is NOT a convention used in pedigree analysis?

Accepted Answer

Diamond represents an affected individual.

Question 19

In a cross between two heterozygous tall pea plants ($$Dd$$), what is the expected genotypic ratio in the F2 generation?

Accepted Answer

$$1 DD : 2 Dd : 1 dd$$

Question 20

Which of the following statements about independent assortment is correct?

Accepted Answer

Genes located on different chromosomes assort independently during gamete formation.

Mendelian Genetics: Principles, Experiments, and Applications

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