Question 1

Which of the following is the primary purpose of drawing a genetic pedigree in a clinical setting?

Accepted Answer

To diagram the inheritance of traits or health conditions through generations and assist in determining the mode of inheritance

Question 2

In a standardized pedigree, what symbol is used to represent a male who is affected by a genetic disorder?

Accepted Answer

A filled square

Question 3

Which of the following is NOT typically included when constructing a complete pedigree for genetic counseling?

Accepted Answer

Exact DNA sequence of each individual

Question 4

A pedigree shows several males affected by hemophilia, while females are mostly unaffected or carriers. What is the most likely mode of inheritance for hemophilia?

Accepted Answer

X-linked recessive

Question 5

If a pedigree symbol is a diamond, what does this typically represent?

Accepted Answer

An individual of unknown sex

Question 6

Which of the following is a key advantage of using standardized pedigree symbols in medical records?

Accepted Answer

They ensure that pedigrees are interpretable by all members of the healthcare team

Question 7

A proband is indicated in a pedigree by:

Accepted Answer

An arrow pointing to the symbol

Question 8

Which equation best represents the probability $$P$$ that a child will inherit an X-linked recessive disorder from a carrier mother and an unaffected father?

Accepted Answer

$$P = 0.5$$

Question 9

In a pedigree, what does a horizontal line connecting a square and a circle represent?

Accepted Answer

Marriage or mating

Question 10

A pedigree is described as 'concise and specific.' Which feature best supports this description?

Accepted Answer

It uses standardized symbols to quickly convey complex genetic information

Question 11

If information about the number of boys and girls in a family is limited, what is the recommended way to represent this in a pedigree?

Accepted Answer

Use a diamond with the number of children inside

Question 12

Which of the following is an ethical issue that may arise when taking a family history for a pedigree?

Accepted Answer

Maintaining confidentiality of sensitive family health information

Question 13

Which of the following symptoms is NOT typically associated with hemophilia?

Accepted Answer

High blood pressure

Question 14

In a pedigree, what does a double horizontal line between two individuals indicate?

Accepted Answer

Consanguinity (blood relationship)

Question 15

Which of the following is a reason why pedigrees are considered a 'diagnostic and screening tool'?

Accepted Answer

They can help identify patterns of inheritance and risk for genetic diseases

Question 16

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

Accepted Answer

Autosomal dominant

Question 17

Which of the following is a correct step in taking a family pedigree?

Accepted Answer

Interview the patient and record information for at least three generations

Question 18

If a pedigree symbol is a circle with a diagonal line through it, what does this indicate?

Accepted Answer

Deceased female

Question 19

Which of the following is a benefit of using a pedigree in genetic counseling?

Accepted Answer

It helps establish rapport with the patient

Question 20

A pedigree shows that a trait skips generations and appears only when both parents are carriers. What is the most likely mode of inheritance?

Accepted Answer

Autosomal recessive

Pedigrees in Genetics: Construction, Interpretation, and Applications

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