Pedigrees X-linked Quiz

Which of the following is a characteristic of X-linked dominant inheritance?

• Affected fathers cannot pass the trait to their sons.

• Affected mothers pass the trait to all their children.

• The trait skips generations.

• Only males are affected.

In a pedigree chart, what symbol is used to represent a female?

• Square

• Circle

• Triangle

• Diamond

Which of the following is an example of an X-linked disorder?

• Cystic fibrosis

• Haemophilia

• Sickle cell anaemia

• Huntington's disease

In X-linked recessive inheritance, which of the following is true?

• Affected males pass the trait to all their daughters.

• Affected females pass the trait to all their sons.

• The trait is more common in females.

• The trait is equally common in males and females.

What does a shaded symbol in a pedigree chart typically represent?

• An unaffected individual

• A carrier of the trait

• An affected individual

• An individual of unknown status

Which of the following best describes phenotypic expression in X-linked dominant disorders?

• Only males express the phenotype.

• Both males and females express the phenotype, but it is more severe in males.

• Only females express the phenotype.

• Both males and females express the phenotype equally.

In a family tree, if a mother is a carrier of an X-linked recessive disorder and the father is unaffected, what is the probability that their son will be affected?

• 0%

• 25%

• 50%

• 100%

Which of the following is NOT a feature of X-linked recessive inheritance?

• More males are affected than females.

• Affected fathers pass the trait to all their daughters.

• Affected mothers pass the trait to all their children.

• Carrier females can pass the trait to their sons.

In a pedigree analysis, what does a half-shaded symbol typically indicate?

• An unaffected individual

• A carrier of the trait

• An affected individual

• An individual of unknown status

Which of the following statements is true about X-linked dominant disorders?

• They are more common in males.

• They are more common in females.

• They affect males and females equally.

• They only affect males.