The nurse is presenting a conference on gene dominance. What does the nurse report as the percentage of children carrying the dominant gene if one parent has a dominant gene and the other parent does not?
25%
50%
75%
100%
The Correct Answer is B
A. If only one parent carries the dominant gene, the probability of a child inheriting it is not 25%, as this would imply a recessive-recessive pairing.
B. In a scenario where one parent is heterozygous for a dominant gene and the other has two recessive alleles, each child has a 50% chance of inheriting the dominant gene. This outcome is based on Mendelian inheritance.
C. A 75% chance would occur in a scenario involving two heterozygous parents, which is not described here.
D. 100% inheritance occurs only when one parent is homozygous dominant, which is also not indicated in this case.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. A ketogenic diet is not recommended during pregnancy, as carbohydrates are essential for fetal growth and energy. Adequate, balanced nutrition is key during pregnancy.
B. While water intake is important, pregnant clients are advised to drink 8–10 glasses of water daily to support increased blood volume and amniotic fluid. Six glasses would be insufficient.
C. An additional 1,000 calories per day is excessive for early pregnancy. During the first trimester, the calorie increase is minimal (approximately 150–200 calories), with more significant increases later in pregnancy.
D. Taking a prenatal vitamin daily ensures adequate intake of essential nutrients like folic acid and iron, which are critical for preventing neural tube defects and supporting maternal health.
Correct Answer is D
Explanation
A. MSAFP does not screen for gestational diabetes. Gestational diabetes is typically screened for between 24–28 weeks of gestation using glucose testing.
B. MSAFP does not assess fetal maturity; tests for maturity, such as lecithin-sphingomyelin ratio, are usually performed in the third trimester if preterm delivery is anticipated.
C. MSAFP does not evaluate ABO incompatibility, which is identified through maternal and fetal blood type testing.
D. MSAFP is a blood test that helps screen for neural tube defects like spina bifida or anencephaly and can also detect certain chromosomal abnormalities when used with additional tests in a quad screen.
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