Question 1

If a plant with genotype RR (red flowers) is crossed with a plant with genotype rr (white flowers) and the resulting F1 generation all have pink flowers, what type of inheritance is being demonstrated?

Accepted Answer

Incomplete dominance

Question 2

A couple has two children. What is the probability that both children are girls? Use the product rule.

Accepted Answer

$$0.25$$

Question 3

In a dihybrid cross between two heterozygous pea plants (YyRr x YyRr), what is the probability of obtaining an offspring that is yellow and wrinkled? (Yellow is dominant to green, round is dominant to wrinkled.)

Accepted Answer

$$\frac{3}{16}$$

Question 4

A testcross is performed between a plant with a dominant phenotype and a plant with a recessive phenotype. If all offspring show the dominant phenotype, what is the genotype of the dominant parent?

Accepted Answer

Homozygous dominant

Question 5

Which of the following best describes codominance, as seen in human ABO blood groups?

Accepted Answer

Both alleles are fully expressed in the phenotype

Question 6

A man with blood type AB marries a woman with blood type O. What are the possible blood types of their children?

Accepted Answer

A and B only

Question 7

Familial Hypercholesterolemia (FH) is a disease of incomplete dominance. If a person with genotype +/fh has twice the normal cholesterol level, what would be the cholesterol level of a person with genotype fh/fh?

Accepted Answer

Six times normal (6x)

Question 8

If the probability of a child being a girl is $$0.5$$, what is the probability that in a family with three children, exactly two are girls?

Accepted Answer

$$0.375$$

Question 9

In a cross between two pink-flowered plants (Rr x Rr, where R = red, r = white, and pink is the heterozygote), what is the expected phenotypic ratio in the F2 generation?

Accepted Answer

1 red : 2 pink : 1 white

Question 10

A woman with genotype IAi and a man with genotype IBi have a child. What is the probability that the child will have blood type O?

Accepted Answer

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

Question 11

Which of the following scenarios best illustrates the product rule in probability?

Accepted Answer

Calculating the probability of having a boy and then a girl in two births

Question 12

If a plant with genotype Pp (purple flowers) is testcrossed with a plant with genotype pp (white flowers), what is the expected phenotypic ratio of the offspring?

Accepted Answer

1 purple : 1 white

Question 13

A person with genotype IAIB has which blood type?

Accepted Answer

Type AB

Question 14

Which of the following is NOT a possible genotype for a person with blood type A?

Accepted Answer

ii

Question 15

If the probability of a pea being yellow is $$\frac{3}{4}$$ and the probability of being round is $$\frac{3}{4}$$, what is the probability of a pea being green and wrinkled?

Accepted Answer

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

Question 16

A couple has three children. What is the probability that all three are boys?

Accepted Answer

$$0.125$$

Question 17

Which of the following best describes the addition rule in probability?

Accepted Answer

The probability of an event that can occur in two or more different ways

Question 18

If a person with genotype IAIB (blood type AB) receives a blood transfusion, which blood types can they safely receive?

Accepted Answer

A, B, AB, and O

Question 19

A plant with genotype Rr (pink flowers) is crossed with a plant with genotype rr (white flowers). What is the expected phenotypic ratio of the offspring?

Accepted Answer

1 pink : 1 white

Question 20

Which of the following statements about incomplete dominance is correct?

Accepted Answer

The heterozygote expresses a phenotype intermediate between the two homozygotes

Probability and Patterns of Inheritance in Genetics

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