ATI RN
Pediatric Genetic Questions
Question 1 of 5
Normal human eggs have:
Correct Answer: A
Rationale: Human eggs (haploid) have 23 chromosomes: 22 autosomes + 1 sex chromosome (X).
Question 2 of 5
The proportion of babies that have an abnormality identifiable at birth is:
Correct Answer: B
Rationale: Approximately 2-3% (1 in 33-50) of newborns have a major congenital anomaly.
Question 3 of 5
The presence of two or more cell lines from different zygotes in a single individual is known as:
Correct Answer: D
Rationale: Chimaerism is two or more cell lines from different zygotes (e.g., fused embryos); mosaicism is from one zygote.
Question 4 of 5
Which of the following disorders does not show X-linked inheritance?
Correct Answer: B
Rationale: Tay-Sachs is autosomal recessive; others are X-linked.
Question 5 of 5
Repeat core sequences consisting of 2,3, or 4 base pairs are known as what?
Correct Answer: B
Rationale: Microsatellites are short tandem repeats of 2-4 base pairs.