A 45-year-old mother gave birth to a baby boy two days ago. The nurse assesses a single palmar crease, poor muscle tone, and low-set ears on the newborn. The nurse understands that these signs most likely indicate the infant has which autosomal abnormalities?

Question

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The signs described, including a single palmar crease, poor muscle tone, and low-set ears, are commonly seen in infants with Down syndrome, which is caused by an extra copy of chromosome 21, also known as Trisomy 21. Options A, B, and D are incorrect as they refer to other chromosomal abnormalities (Trisomy 13, Trisomy 18, and Trisomy 26, respectively) which present with different sets of clinical signs and symptoms.

A 45-Year-Old Mother Gave Birth to a Baby Boy Two