Genetics Practice Test 6
Genetics NCLEX Practice Test
Genetics is a key topic within the NCLEX test plan, located under Nursing Science → Clinical Foundations → Genetics. This section interprets inheritance patterns and counseling considerations for patient education and screening. Each test contains 50 questions designed to mirror the difficulty and variety of the real exam.
This is the 6th part of the Genetics series. To explore all practice tests under this topic, use the “Back to Main Topic” button at the end of the page.
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In the Genetics Study Cards section, shared by real NCLEX candidates, you’ll find concise summaries and high-yield insights related to the most tested concepts. It’s a perfect space to reinforce challenging topics and sharpen your recall through quick, focused repetitions. Short, powerful, and repeatable!
Genetics Practice Test 6
You are reinforcing counseling for two parents that are preparing for the birth of their first child. The mother has sickle cell anemia. So the father has decided to undergo genetic testing to determine if he is a carrier or not. He finds out that he is not a carrier. You tell them that their baby has what chance of having sickle cell anemia?
- 25%
- 50%
- 75%
- 0%
Explanation: Answer reason: A mother with sickle cell anemia has genotype HbSS and will pass an HbS allele to all offspring. If the father is not a carrier, he is HbAA and can only pass a normal HbA allele. Therefore, all children will be HbAS (carriers) but none will have HbSS disease, making the probability of sickle cell anemia zero; a common confusion is mixing disease risk with carrier risk (which would be 100% here).
Baby's sex is determined by: The sex of a human baby is genetically determined by which the following?
- Mother’s X chromosome
- Father’s Y chromosome
- A combination of both parents’ chromosomes
- Father’s sperm
Explanation: Answer reason: Fertilization with an X-bearing sperm produces XX (typically female), and fertilization with a Y-bearing sperm produces XY (typically male), so the determining variable is which sperm fertilizes the egg. This makes the paternal gamete the decisive factor for chromosomal sex at conception. A common distractor is focusing only on the Y chromosome itself, but the practical determinant in conception is the sperm that delivers either X or Y.
If a plant with a genotype of Tt (tall) is crossed with a plant with genotype tt (short), what is the probability that the offspring will be short?
- 0%
- 25%
- 50%
- 75%
Explanation: Answer reason: The heterozygous parent (Tt) produces gametes T and t in equal proportions, while the recessive parent (tt) produces only t gametes. The possible offspring are therefore Tt and tt in a 1:1 ratio, making half of the offspring homozygous recessive. Options suggesting 25% or 75% would fit different parental genotype combinations (e.g., Tt × Tt), not this test cross.
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