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ATI RN · Obstetrics and Pediatrics · Pediatrics Genetics

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Showing all 5 practice questions with expert explanatory rationales.

Question 1 of 5

Which P arm of the following chromosomes carries rDNA genes?

A. 3

B. 15

C. 6

D. 12

Expert Explanatory Rationale

Correct Answer: 15

Question 2 of 5

Which of the following conditions shows anticipation in paternal transmission?

A. Huntington disease

B. Marfan syndrome

C. Cystic fibrosis

D. Fragile X syndrome

Expert Explanatory Rationale

Correct Answer: Fragile X syndrome

Question 3 of 5

Normal pregnancy results from:

A. 1 maternal set of genes and 1 paternal set of genes

B. 1 maternal set of genes and 0 paternal set of genes

C. 0 maternal set of genes and 1 paternal set of genes

D. 2 maternal set of genes and 0 paternal set of genes

Expert Explanatory Rationale

Correct Answer: 1 maternal set of genes and 1 paternal set of genes

Question 4 of 5

The growing promising technique that is still in the research stage and being piloted in high-risk pregnancies for prenatal diagnosis is

A. screening anatomy sonogram at 18 weeks' gestation

B. fetal sonogram at first trimester for detection of nuchal translucency

C. quad test

D. cell-free fetal DNA in maternal blood

Expert Explanatory Rationale

Correct Answer: cell-free fetal DNA in maternal blood

Question 5 of 5

An extra finger in humans is rare but is due to a dominant gene. When one parent is normal and the other parent has an extra finger but is heterozygous for the trait, what is the probability that the first child will be normal?

A. 0%

B. 25%

C. 50%

D. 75%

Expert Explanatory Rationale

Correct Answer: 50%

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