Question 1

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

Accepted Answer

Genotype refers to the genetic makeup of an organism, while phenotype refers to the observable traits.

Question 2

A woman with genotype $$X^N X^n ($$carrier for color blindness) and a man with genotype $$X^n Y ($$color blind) have a child. What is the probability that their son will be color blind?

Accepted Answer

$$50\%$$

Question 3

Which inheritance pattern is demonstrated when both alleles in a heterozygote are fully expressed, such as in human blood type AB?

Accepted Answer

Codominance

Question 4

A child has type O blood. Which of the following parental genotype combinations could produce this child?

Accepted Answer

$$I^A i$$ 	ext{ and } I^B i$

Question 5

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

Accepted Answer

Males only need one copy of the recessive allele on their single X chromosome to express the disorder.

Question 6

A red flower ($$RR) is $$crossed with a white flower ($$WW) $$and all offspring are pink ($$RW). $$What type of inheritance is this?

Accepted Answer

Incomplete dominance

Question 7

Which of the following is an example of polygenic inheritance?

Accepted Answer

Skin color

Question 8

If a mutation occurs in a gene, which of the following is a possible outcome?

Accepted Answer

The mutation may cause a genetic disorder, have no effect, or be beneficial.

Question 9

A woman with genotype $$I^A I^B$$ and a man with genotype $$I^B i$$ have a child. What is the probability that the child will have type B blood?

Accepted Answer

$$50\%$$

Question 10

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

Accepted Answer

A dominant allele will mask the effect of a recessive allele in a heterozygote.

Question 11

A man with normal vision and a woman who is a carrier for color blindness have a son. What is the probability that their son will be color blind?

Accepted Answer

$$50\%$$

Question 12

Which of the following best describes the concept of multiple alleles?

Accepted Answer

A gene with more than two possible alleles in the population.

Question 13

Which of the following is a real-world example of codominance in humans?

Accepted Answer

AB blood type

Question 14

A person with genotype $$AaBbCc$$ for a polygenic trait mates with another person with the same genotype. Which of the following best describes the expected phenotypic variation in their offspring?

Accepted Answer

A wide range of phenotypes due to additive effects of multiple genes

Question 15

Which of the following is true regarding sex-linked inheritance?

Accepted Answer

Most sex-linked traits are associated with the X chromosome.

Question 16

A mutation in which type of cell is most likely to be passed on to offspring?

Accepted Answer

Germ cell (gamete)

Question 17

Which of the following best explains why a heterozygous female carrier for an X-linked recessive disorder does not usually express the disorder?

Accepted Answer

She has a dominant normal allele on one X chromosome that masks the recessive allele.

Question 18

Which of the following is an example of a mutation causing a visible phenotype?

Accepted Answer

Polydactyly (extra fingers or toes)

Question 19

If a trait is controlled by incomplete dominance, what would be the expected phenotype ratio in the offspring of two heterozygotes?

Accepted Answer

$$1:2:1 ($$one dominant, two intermediate, one recessive)

Question 20

Which of the following best describes the effect of polygenic inheritance on human height?

Accepted Answer

Height is influenced by multiple genes, resulting in a continuous range of phenotypes.

Genetics: Patterns of Inheritance and Genetic Variation

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