Williams syndrome is due to the deletion of one elastin allele located in chromosome:

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Question 1 of 5

Williams syndrome is due to the deletion of one elastin allele located in chromosome:

Correct Answer: A

Rationale: Williams syndrome results from a microdeletion on chromosome 7q11.23 , affecting the elastin gene, leading to cardiovascular and developmental issues (NIH). Other chromosomes (B-E) are unrelated.

Question 2 of 5

An infant of a diabetic mother (IDM) appears with hypoglycemia is mostly due to:

Correct Answer: C

Rationale: Hyperinsulinemia in IDMs from maternal hyperglycemia causes postnatal hypoglycemia (AAP). Other options (A, B, D, E) don’t fit.

Question 3 of 5

During genetic counseling, choices for reproduction are decided by the:

Correct Answer: B

Rationale: The family decides reproductive choices, with A-D providing guidance, per ethics (ACMG).

Question 4 of 5

The most accurate assessment of gestational age in the second trimester is:

Correct Answer: B

Rationale: Biparietal diameter is the most accurate second-trimester measure (ACOG). D is first-trimester, and A, C, E are supplementary.

Question 5 of 5

All infants should receive vitamin K at birth. Additional vitamin K is indicated in all of the following conditions except:

Correct Answer: C

Rationale: Formula-fed infants don’t need extra vitamin K as formulas are fortified (AAP). A, B, D, E increase deficiency risk.

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