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 purpose of a Punnett square in genetics?

Accepted Answer

To predict the possible genotypes and phenotypes of offspring from a genetic cross.

Question 2

A heterozygous tall pea plant (Tt) is crossed with a homozygous short pea plant (tt). What is the expected phenotypic ratio of the offspring?

Accepted Answer

1 tall : 1 short

Question 3

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

Accepted Answer

Pea plants can self-pollinate and cross-pollinate, allowing controlled breeding.

Question 4

Which of the following is an example of incomplete dominance?

Accepted Answer

A red flower crossed with a white flower produces pink flowers.

Question 5

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 6

Which of the following best describes pleiotropy?

Accepted Answer

One gene affects multiple, seemingly unrelated traits.

Question 7

A woman with blood type A (genotype $$I^A i) $$and a man with blood type B (genotype $$I^B i) $$have a child. Which blood type is NOT possible for their child?

Accepted Answer

None of the above; all are possible.

Question 8

Which of the following is an example of polygenic inheritance?

Accepted Answer

Height in humans

Question 9

Which statement about linked genes is correct?

Accepted Answer

Linked genes are located close together on the same chromosome.

Question 10

Which of the following best describes the law of independent assortment?

Accepted Answer

Alleles for different genes separate independently during gamete formation.

Question 11

A dihybrid cross between two heterozygous pea plants ($$RrYy 	imes RrYy) $$produces what phenotypic ratio in the offspring?

Accepted Answer

9:3:3:1

Question 12

Which of the following is an example of environmental influence on phenotype?

Accepted Answer

A Himalayan rabbit's fur color changes with temperature.

Question 13

Which of the following best describes codominance?

Accepted Answer

Both alleles are fully expressed in the phenotype.

Question 14

Which of the following is NOT a reason why Mendel's work was initially ignored by the scientific community?

Accepted Answer

His experiments were not repeatable.

Question 15

Which of the following is a correct statement about sex-linked traits?

Accepted Answer

They are more likely to affect males than females.

Question 16

Which of the following best explains the concept of genetic drift?

Accepted Answer

A change in allele frequencies due to random events in small populations.

Question 17

Which of the following is an example of a human genetic disorder caused by nondisjunction?

Accepted Answer

Down syndrome

Question 18

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

Accepted Answer

Genotype is the genetic makeup; phenotype is the physical appearance.

Question 19

Which of the following is a correct example of a monohybrid cross?

Accepted Answer

Crossing $$Tt 	imes Tt$$ for plant height.

Question 20

If a couple has three children, what is the probability that all three will be girls? (Assume the probability of having a girl is $$0.5$$ for each child.)

Accepted Answer

$$0.125$$

Genetics and Inheritance: Study Guide (Chapters 13–15)

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