Q: Which probability rule should be used to calculate the chance of two independent events both occurring?

Multiplication rule: $P(A \text{ and } B) = P(A) \times P(B)$

Question 1

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

Accepted Answer

The two alleles for each gene separate during gamete formation, so each gamete carries only one allele for each gene.

Question 2

In a monohybrid cross between two heterozygous pea plants (Pp x Pp), what is the expected phenotypic ratio in the F2 generation?

Accepted Answer

$3:1$

Question 3

Which of the following is an example of codominance in humans?

Accepted Answer

The ABO blood group system, where both A and B alleles are expressed in AB individuals.

Question 4

A pea plant with genotype YyRr is crossed with another YyRr plant. What is the probability that an offspring will have the genotype yyrr?

Accepted Answer

$\frac{1}{16}$

Question 5

Which scenario best illustrates the Law of Independent Assortment?

Accepted Answer

Alleles for seed color and seed shape are inherited independently in a dihybrid cross.

Question 6

A man with blood type AB and a woman with blood type O have a child. What is the probability that the child will have blood type A?

Accepted Answer

$\frac{1}{2}$

Question 7

Which of the following is an example of pleiotropy?

Accepted Answer

A single gene affecting both eye color and blood pressure.

Question 8

In Labrador retrievers, coat color is determined by two genes: B (black/brown) and E (fur pigment deposition). What is the phenotype of a dog with genotype bbEe?

Accepted Answer

Brown coat

Question 9

If two parents are both heterozygous for albinism (Aa x Aa), what is the probability that their child will be albino?

Accepted Answer

$\frac{1}{4}$

Question 10

Which of the following best describes polygenic inheritance?

Accepted Answer

Multiple genes contribute additively to a single trait, such as human skin color.

Question 11

A cross between a homozygous purple-flowered pea plant (PP) and a homozygous white-flowered pea plant (pp) produces F1 offspring. What are the genotypes and phenotypes of the F1 generation?

Accepted Answer

All F1 are heterozygous (Pp) and have purple flowers.

Question 12

Which of the following is NOT an exception to Mendel's rules?

Accepted Answer

Law of Segregation

Question 13

In a dihybrid cross (YyRr x YyRr), what is the expected phenotypic ratio in the F2 generation?

Accepted Answer

$9:3:3:1$

Question 14

A pedigree analysis reveals that a trait appears in every generation and affected individuals have at least one affected parent. What is the most likely mode of inheritance?

Accepted Answer

Dominant

Question 15

Which probability rule should be used to calculate the chance of two independent events both occurring?

Accepted Answer

Multiplication rule: $P(A 	ext{ and } B) = P(A) 	imes P(B)$

Question 16

Which genotype would result in a person with blood type O in the ABO system?

Accepted Answer

ii

Question 17

A child is born with Tay-Sachs disease. Both parents are healthy. What are the possible genotypes of the parents?

Accepted Answer

Both parents are heterozygous (Bb).

Question 18

Which of the following best explains why human traits often do not follow simple Mendelian patterns?

Accepted Answer

Many traits are influenced by multiple genes and environmental factors.

Question 19

In a trihybrid cross PpYyRr x Ppyyrr, what is the probability of obtaining an offspring with genotype pp yy Rr?

Accepted Answer

$\frac{1}{16}$

Question 20

Which of the following is an example of epistasis?

Accepted Answer

A gene for pigment deposition (E/e) masking the effect of a gene for coat color (B/b) in Labrador retrievers.

Mendel and the Gene: Patterns of Inheritance

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