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?
1. Trisomy 13
2. Trisomy 18
3. Trisomy 21
4. Trisomy 26
Correct Answer: 3
Rationale 1: A single palmar crease and low-set ears are not characteristics of trisomy 13.
Rationale 2: A single palmar crease and low-set ears are not characteristics of trisomy 18.
Rationale 3: A single palmar crease and low-set ears are characteristics of trisomy 21 (Down syndrome).
Rationale 4: Trisomy 26 is not an autosomal abnormality.
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