While talking with a pregnant woman who has undergone genetic testing, the woman informs the nurse that her baby will be born with Down syndrome. The nurse understands that Down syndrome is an example of:
Trisomy numeric abnormality
Multifactorial inheritance
X-linked recessive inheritance
Chromosomal deletion
The Correct Answer is A
Choice A Reason: Trisomy numeric abnormality. Down syndrome is a genetic disorder that occurs when a person has three copies of chromosome 21 instead of two. This extra chromosome causes various physical and mental features that vary from person to person. Down syndrome is also called trisomy 21 because it involves three copies of chromosome 21.
Choice B Reason: Multifactorial inheritance is incorrect because it refers to a type of genetic disorder that results from the interaction of multiple genes and environmental factors. Examples of multifactorial disorders include cleft lip or palate, neural tube defects, diabetes, hypertension, and some types of cancer.
Choice C Reason: X-linked recessive inheritance is incorrect because it refers to a type of genetic disorder that affects males more than females because it is caused by a mutation on the X chromosome. Females have two X chromosomes, so they can be carriers or affected depending on whether they inherit one or two copies of the mutated gene. Males have one X chromosome and one Y chromosome, so they are always affected if they inherit the mutated gene from their mother. Examples of X-linked recessive disorders include hemophilia, color blindness, and Duchenne muscular dystrophy.
Choice D Reason: Chromosomal deletion is incorrect because it refers to a type of genetic disorder that occurs when a part of a chromosome is missing or deleted. This can cause various physical and mental problems depending on the size and location of the deletion. Examples of chromosomal deletion
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A Reason: Linea nigra is a dark vertical line that appears on the abdomen of some pregnant women. It is caused by increased melanin production and usually fades after delivery.
Choice B Reason: Pica is a condition in which a person has an abnormal desire to eat substances that are not food, such as ice, clay, dirt, or chalk. It is more common in pregnant women and may indicate a deficiency in iron or other nutrients.
Choice C Reason: Ballottement is a technique of palpating a floating structure by bouncing it gently and feeling it rebound. In obstetrics, it can be used to detect the presence of the fetus by feeling its head move when the cervix is tapped.
Choice D Reason: Quickening is the first perception of fetal movements by the pregnant woman. It usually occurs between 16 and 20 weeks of gestation.
Correct Answer is ["C","D","E"]
Explanation
Choice A: Absence of pain is not a sign of abruptio placenta. Abruptio placenta is a condition where the placenta separates from the uterine wall before delivery, causing bleeding and pain. The pain is usually severe and constant.
Choice B: Insidious onset is not a sign of abruptio placenta. Abruptio placenta is usually a sudden and acute event that occurs in the third trimester or during labor.
Choice C: Dark red vaginal bleeding is a sign of abruptio placenta. The bleeding is caused by the rupture of blood vessels between the placenta and the uterus. The blood may be dark red because it is old or clotted.
Choice D: Rigid uterus is a sign of abruptio placenta. The uterus becomes hard and tense as a result of the bleeding and contraction of the uterine muscles. This can impair the blood flow to the fetus and cause fetal distress.
Choice E: Absent fetal heart tones is a sign of abruptio placenta. The loss of blood and oxygen to the fetus can cause fetal death or stillbirth. Fetal heart tones can be detected by using a Doppler device or a fetoscope.
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