Q: Which equation would you use to predict the probability of two independent events occurring together?

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

Question 1

Which statement best describes Mendel's Law of Independent Assortment?

Accepted Answer

Alleles of genes on different chromosomes are distributed independently into gametes during meiosis.

Question 2

A cross between two heterozygous pea plants (Pp) for purple flowers results in offspring with a 3:1 ratio of purple to white flowers. Which principle does this illustrate?

Accepted Answer

Law of Segregation

Question 3

If a male inherits an X-linked recessive allele for color blindness from his mother, what is the probability he will express the trait?

Accepted Answer

$$P = 1$$

Question 4

Which genotype would result in type AB blood in the ABO blood typing system?

Accepted Answer

$$I^A I^B$$

Question 5

A dihybrid cross between two heterozygous pea plants (YyRr x YyRr) for seed color (Y=yellow, y=green) and seed shape (R=round, r=wrinkled) produces offspring in what phenotypic ratio?

Accepted Answer

$$9:3:3:1$$

Question 6

Which of the following best explains why males are more likely to be affected by X-linked recessive disorders?

Accepted Answer

Males have only one X chromosome, so a single recessive allele will result in the disorder.

Question 7

Which scenario demonstrates incomplete dominance?

Accepted Answer

A cross between red and white snapdragons produces pink offspring.

Question 8

If a woman is heterozygous for an X-linked recessive disorder and her partner is unaffected, what is the probability that their son will inherit the disorder?

Accepted Answer

$$P = 0.5$$

Question 9

Which of the following is an example of a trait influenced by multiple alleles?

Accepted Answer

Blood type in humans

Question 10

A pedigree shows a trait that skips generations and affects males more than females. What is the most likely mode of inheritance?

Accepted Answer

X-linked recessive

Question 11

Which statement about the relationship between genes, alleles, and chromosomes is correct?

Accepted Answer

Genes are segments of DNA located on chromosomes, and alleles are different forms of a gene.

Question 12

Which of the following best describes codominance?

Accepted Answer

Both alleles are expressed equally in the phenotype, such as AB blood type.

Question 13

A heterozygous individual for sickle cell anemia ($$Hb^A Hb^S) $$shows resistance to malaria. What is this an example of?

Accepted Answer

Heterozygote advantage

Question 14

Which equation would you use to predict the probability of two independent events occurring together?

Accepted Answer

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

Question 15

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

Accepted Answer

Pea plants have a long generation time.

Question 16

Which of the following best explains the concept of linked genes?

Accepted Answer

Genes located close together on the same chromosome tend to be inherited together.

Question 17

Which of the following is an example of a polygenic trait?

Accepted Answer

Height in humans

Question 18

If a trait is controlled by two genes with unlinked loci, what is the expected phenotypic ratio in the F2 generation from a dihybrid cross?

Accepted Answer

$$9:3:3:1$$

Question 19

Which of the following statements about dominant and recessive alleles is correct?

Accepted Answer

Dominant alleles mask the effect of recessive alleles in heterozygotes.

Question 20

Which environmental factor can influence the expression of genes?

Accepted Answer

Temperature

Patterns of Inheritance: Mendelian Genetics and Chromosomal Basis

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