Q: Which equation correctly represents the rule of multiplication for independent events in genetics?

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

Question 1

Which of the following best describes Mendel's law of segregation?

Accepted Answer

Each individual has two factors for each trait, which separate during gamete formation so each gamete contains only one factor from each pair.

Question 2

A pea plant with genotype $$Gg ($$green pod, heterozygous) is crossed with a true-breeding yellow pod plant ($$gg). $$What is the expected phenotypic ratio among the offspring?

Accepted Answer

1 green pod : 1 yellow pod

Question 3

Which statement about alleles is correct?

Accepted Answer

Alleles are different forms of a gene located at the same locus on homologous chromosomes.

Question 4

In a two-trait cross between $$TTGG ($$tall, green pods) and $$ttgg ($$short, yellow pods), what is the expected phenotypic ratio in the $$F_2$$ generation if the traits assort independently?

Accepted Answer

9:3:3:1

Question 5

A pedigree shows a trait that appears in children whose parents do not express the trait, and both males and females are affected equally. What is the most likely mode of inheritance?

Accepted Answer

Autosomal recessive

Question 6

Which genetic disorder is caused by a lack of the enzyme needed to convert methemoglobin back to hemoglobin, resulting in bluish-purplish skin?

Accepted Answer

Methemoglobinemia

Question 7

If a person with genotype $$Aa ($$heterozygous for a dominant disorder) has children with a person who is $$aa ($$unaffected), what is the probability that their child will be affected?

Accepted Answer

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

Question 8

Which of the following best explains incomplete dominance?

Accepted Answer

The heterozygote has an intermediate phenotype between the two homozygotes.

Question 9

A woman with genotype $$I^A I^B$$ and a man with genotype $$ii$$ have children. What are the possible blood types of their offspring?

Accepted Answer

A and B only

Question 10

Which of the following is an example of pleiotropy?

Accepted Answer

A single gene affecting multiple traits, such as Marfan syndrome causing abnormalities in connective tissue, heart, and eyes.

Question 11

A male inherits an X-linked recessive disorder. Which parent must have contributed the affected allele?

Accepted Answer

His mother

Question 12

Which statement about polygenic inheritance is correct?

Accepted Answer

Polygenic traits result from the additive effects of two or more genes, producing continuous variation.

Question 13

If two heterozygous carriers for cystic fibrosis ($$Ff) $$have a child, what is the probability that the child will have cystic fibrosis?

Accepted Answer

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

Question 14

Which of the following best describes the chromosomal theory of inheritance?

Accepted Answer

Genes are located on chromosomes, which are the carriers of genetic information.

Question 15

A fruit fly with genotype $$LlGg ($$long wings, gray body) is testcrossed with $$llgg ($$short wings, black body). If the offspring show a 1:1:1:1 ratio, what does this indicate about the parent fly's genotype?

Accepted Answer

The parent fly is heterozygous for both traits and the genes assort independently.

Question 16

Which of the following is true regarding X-linked recessive disorders?

Accepted Answer

Males express the disorder if they inherit the allele from their mother.

Question 17

Which equation correctly represents the rule of multiplication for independent events in genetics?

Accepted Answer

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

Question 18

Which of the following is a real-world example of incomplete dominance in humans?

Accepted Answer

Familial hypercholesterolemia, where heterozygotes have intermediate cholesterol levels.

Question 19

Which of the following best describes gene linkage?

Accepted Answer

Two traits located on the same chromosome tend to be inherited together and do not assort independently.

Patterns of Inheritance: Mendel’s Laws and Beyond

Study Guide - Practice Questions

Study Guide - Flashcards