Question 1

Which of the following best describes the relationship between genes and chromosomes in diploid cells?

Accepted Answer

Genes are located on chromosomes, and each chromosome contains many genes arranged linearly.

Question 2

A couple, both carriers for sickle cell trait (HbA/HbS), are planning to have a child. What is the probability that their child will have sickle cell disease (HbS/HbS)?

Accepted Answer

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

Question 3

Which of the following is an example of codominance?

Accepted Answer

A person with blood type AB expresses both A and B antigens equally.

Question 4

In a pedigree, what does a filled-in square represent?

Accepted Answer

An affected male

Question 5

A woman with genotype XHXh (carrier for hemophilia) and a man with genotype XHY have a child. What is the probability that their son will have hemophilia?

Accepted Answer

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

Question 6

Which of the following best explains why most recessive inherited diseases are not evenly distributed in a population?

Accepted Answer

Recessive diseases are more common in populations with high rates of consanguinity.

Question 7

A man with blood type AB and a woman with blood type A (genotype AO) have a child. Which blood type is NOT possible for their child?

Accepted Answer

Type O

Question 8

Which of the following is an example of pleiotropy?

Accepted Answer

A single gene affects both red blood cell shape and resistance to malaria.

Question 9

If a woman who is a carrier for Tay-Sachs disease (Tt) marries a man who is homozygous dominant (TT), what is the probability that their child will be a carrier?

Accepted Answer

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

Question 10

Which of the following statements about Mendel's law of segregation is correct?

Accepted Answer

Alleles separate during gamete formation so that each gamete receives only one allele for each gene.

Question 11

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

Accepted Answer

Autosomal dominant

Question 12

Which of the following best describes polygenic inheritance?

Accepted Answer

Multiple genes contribute to a single trait, such as height or skin color.

Question 13

A woman with Huntington's disease (Hh) and a man without the disease (hh) have a child. What is the probability that their child will develop Huntington's disease?

Accepted Answer

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

Question 14

Which of the following is true about X-linked recessive inheritance?

Accepted Answer

More males than females are affected.

Question 15

If a trait is X-linked dominant and the father is affected while the mother is unaffected, what is the probability that their daughter will be affected?

Accepted Answer

$$1$$

Question 16

Which of the following best describes the chromosome theory of inheritance?

Accepted Answer

Genes are located on chromosomes, and chromosomes are the vehicles of genetic inheritance.

Question 17

A man with genotype XHY (normal) and a woman with genotype XhXh (hemophilia) have a child. What is the probability that their daughter will have hemophilia?

Accepted Answer

$$0.5$$

Question 18

Which of the following is a real-world example of incomplete dominance?

Accepted Answer

A red snapdragon crossed with a white snapdragon produces pink offspring.

Question 19

In a family pedigree, which pattern would suggest an X-linked dominant disorder?

Accepted Answer

All daughters of affected fathers are affected, but none of the sons.

Question 20

A couple, both heterozygous for cystic fibrosis (Ff), have a child. What is the probability that their child will be unaffected (not a carrier and not affected)?

Accepted Answer

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

Patterns of Inheritance: Genes, Chromosomes, and Pedigrees

Guida di studio - Domande di pratica

Study guide - Flashcard