Q: Which formula would you use to calculate 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 Mendel's Law of Segregation?

Accepted Answer

Alleles for a trait separate during gamete formation, so each gamete receives only one allele for each gene.

Question 2

A pea plant with genotype $$Pp ($$where $$P is $$dominant for purple flowers and $$p is $$recessive for white flowers) is crossed with another $$Pp$$ plant. What is the expected ratio of purple to white flowers in the offspring?

Accepted Answer

$$3:1$$

Question 3

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

Accepted Answer

A plant with genotype $$YyRr$$ produces gametes $$YR$$, $$Yr$$, $$yR$$, and $$yr in $$equal proportions.

Question 4

If two heterozygous parents for a recessive genetic disorder ($$Aa) $$have a child, what is the probability that the child will be affected by the disorder?

Accepted Answer

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

Question 5

In a dihybrid cross between $$YyRr$$ plants, what is the expected phenotypic ratio in the F2 generation?

Accepted Answer

$$9:3:3:1$$

Question 6

Which of the following is an example of incomplete dominance?

Accepted Answer

A cross between red and white snapdragons produces pink offspring.

Question 7

A testcross is used to determine the genotype of a plant with a dominant phenotype. Which genotype is crossed with the plant in question?

Accepted Answer

Homozygous recessive

Question 8

If a parent with genotype $$AaBb is $$crossed with another $$AaBb$$ parent, what is the probability that an offspring will have the genotype $$aabb$$?

Accepted Answer

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

Question 9

Which of the following best describes pleiotropy?

Accepted Answer

One gene affects multiple phenotypic traits.

Question 10

In human blood types, the ABO system is an example of which genetic concept?

Accepted Answer

Multiple alleles

Question 11

Which of the following is an example of polygenic inheritance?

Accepted Answer

Human skin color

Question 12

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

Accepted Answer

Autosomal dominant

Question 13

If a child inherits a recessive disorder, but both parents are phenotypically normal, what must be true about the parents' genotypes?

Accepted Answer

Both parents are heterozygous carriers.

Question 14

Which formula would you use to calculate the probability of two independent events both occurring?

Accepted Answer

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

Question 15

Which genetic phenomenon explains why Labrador retrievers can have black, brown, or yellow coats depending on the interaction of two genes?

Accepted Answer

Epistasis

Question 16

A woman who is heterozygous for the widow's peak allele ($$Ww) $$and a man who is homozygous recessive ($$ww) $$have a child. What is the probability that the child will have a widow's peak?

Accepted Answer

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

Question 17

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

Accepted Answer

Pea plants have only one gene per trait.

Question 18

Which statement about dominant and recessive alleles is correct?

Accepted Answer

Dominant alleles mask the effect of recessive alleles in heterozygotes.

Question 19

Which of the following best describes codominance?

Accepted Answer

Both alleles are fully expressed in the phenotype of a heterozygote.

Question 20

A couple, both carriers for cystic fibrosis ($$Ff$$), have two children. What is the probability that both children will be carriers but not affected?

Accepted Answer

Mendelian Genetics: Principles, Patterns, and Applications

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