Q: Which equation correctly represents the probability of two independent events both occurring?

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

Question 1

Which of the following best describes the difference between a character and a trait in Mendelian genetics?

Accepted Answer

A character is a heritable feature that varies among individuals, while a trait is a specific variant of that character.

Question 2

Why were pea plants ideal for Mendel's genetic experiments?

Accepted Answer

They have a short generation time, produce large numbers of offspring, and their mating can be controlled.

Question 3

Which statement correctly explains Mendel's Law of Segregation?

Accepted Answer

Each individual inherits two alleles for each character, but only one allele is passed to each gamete.

Question 4

In a monohybrid cross between two heterozygous pea plants (Pp x Pp), what is the expected fraction of offspring with the recessive phenotype?

Accepted Answer

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

Question 5

If two parents are both carriers for a recessive genetic disorder (Aa x Aa), what is the probability that their child will have the disorder?

Accepted Answer

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

Question 6

Which of the following scenarios best illustrates the Law of Independent Assortment?

Accepted Answer

A gene for flower color and a gene for seed shape, located on different chromosomes, segregate independently during gamete formation.

Question 7

A couple each has a sibling who died from a recessively inherited disease. What is the probability that their child will have the disease, assuming both are carriers?

Accepted Answer

$$\frac{1}{9}$$

Question 8

Which type of dominance is illustrated when the heterozygote displays a phenotype intermediate between both homozygotes?

Accepted Answer

Incomplete dominance

Question 9

In a dihybrid cross between two individuals with genotype RrYy x RrYy, what is the probability of obtaining an offspring with genotype rrYY?

Accepted Answer

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

Question 10

Which of the following best describes pleiotropy?

Accepted Answer

One gene affects multiple, seemingly unrelated phenotypic traits.

Question 11

A pedigree shows a trait that appears in every generation and affects both males and females equally. What is the most likely mode of inheritance?

Accepted Answer

Autosomal dominant

Question 12

Which of the following is an example of a multifactorial disorder?

Accepted Answer

Heart disease

Question 13

In the ABO blood group system, which genotype(s) result in blood type AB?

Accepted Answer

IAIB

Question 14

Which genetic principle explains why genes located close together on the same chromosome tend to be inherited together?

Accepted Answer

Linkage

Question 15

A testcross is used to determine the genotype of an individual with a dominant phenotype. Which result would indicate the individual is heterozygous?

Accepted Answer

Some offspring display the recessive phenotype.

Question 16

Which equation correctly represents the probability of two independent events both occurring?

Accepted Answer

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

Question 17

Which of the following best describes polygenic inheritance?

Accepted Answer

Multiple genes contribute additively to a single trait.

Question 18

In Labrador retrievers, coat color is determined by two genes: one for pigment color (B for black, b for brown) and one for pigment deposition (E for color, e for no color). What is the expected phenotype of a dog with genotype bbEe?

Accepted Answer

Brown coat

Question 19

Which prenatal test involves removing a sample of the placenta to test for genetic disorders?

Accepted Answer

Chorionic villus sampling (CVS)

Question 20

Which of the following is true regarding carriers of recessive genetic disorders?

Accepted Answer

Carriers are heterozygous and do not show symptoms of the disorder.

Mendel and the Gene Idea: Principles of Inheritance

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