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 Independent Assortment?

Accepted Answer

Alleles for different traits segregate independently of one another during gamete formation.

Question 2

A pea plant with genotype $$Tt ($$where $$T is $$tall and $$t is $$short) is self-fertilized. What is the expected phenotypic ratio in the offspring?

Accepted Answer

$$3:1 ($$tall:short)

Question 3

Which of the following is an example of a dihybrid cross?

Accepted Answer

Crossing $$AaBb 	imes AaBb$$

Question 4

If two heterozygous individuals ($$Aa) $$are crossed, what is the probability of producing an offspring with the genotype $$aa$$?

Accepted Answer

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

Question 5

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

Accepted Answer

They have easily observable traits and can self-fertilize or be cross-fertilized.

Question 6

A test cross is performed between a plant with an unknown genotype and a homozygous recessive plant. If all offspring display the dominant phenotype, what is the genotype of the unknown parent?

Accepted Answer

Homozygous dominant

Question 7

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 8

In a pedigree, which pattern suggests an autosomal dominant inheritance?

Accepted Answer

The trait appears in every generation and affected individuals have at least one affected parent.

Question 9

Which of the following is true about sex chromosomes in humans?

Accepted Answer

Females have two X chromosomes, while males have one X and one Y chromosome.

Question 10

A couple has two children. What is the probability that both are boys? (Assume the probability of having a boy or girl is equal.)

Accepted Answer

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

Question 11

Which of the following best describes the concept of 'degrees of freedom' in a chi-square test?

Accepted Answer

The number of categories minus one

Question 12

If a genetic cross yields a phenotypic ratio of $$9:3:3:1$$, what type of cross was performed?

Accepted Answer

Dihybrid cross with independent assortment

Question 13

Which of the following is NOT a possible explanation for why a trait might not follow Mendel's laws?

Accepted Answer

Independent assortment of alleles

Question 14

A woman who is a carrier for a recessive X-linked disorder marries a man who does not have the disorder. What is the probability that their son will have the disorder?

Accepted Answer

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

Question 15

Which of the following best describes artificial cross-fertilization?

Accepted Answer

Manually transferring pollen from one plant to another to control parentage

Transmission Genetics: Mendelian Principles and Extensions

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