What pattern of inheritance applies to Cystic Fibrosis?
Mitochondrial
X-linked dominant
Autosomal recessive
Autosomal dominant
The Correct Answer is C
(A) Mitochondrial: CF is not maternally inherited through mitochondrial DNA.
(B) X-linked Dominant: CF does not involve the X chromosome.
(C) Autosomal Recessive: Cystic fibrosis (CF) occurs when an individual inherits two mutated copies of the CFTR gene (one from each parent). Both parents must be carriers for a child to develop the disease.
(D) Autosomal Dominant: CF requires two copies of the mutated gene, unlike dominant disorders that require only one.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["B","C"]
Explanation
(A) Hypokalemia: Addison’s disease does not cause potassium loss.
(B) Hyperkalemia: Addison’s disease involves adrenal insufficiency, leading to low aldosterone levels. Aldosterone normally promotes potassium excretion; without it, potassium accumulates in the blood.
(C) Hyponatremia: Lack of aldosterone also prevents sodium retention, leading to excess sodium loss in urine and low sodium levels.
(D) Hypernatremia: Sodium levels are low due to excessive sodium excretion.
Correct Answer is D
Explanation
(A) Lethargy: More common in hypercalcemia.
(B) Hypertension: Hypocalcemia is more likely to cause hypotension due to reduced contractility.
(C) Bone Pain: More common in hypercalcemia due to bone resorption.
(D) Positive Chvostek’s Sign: Facial twitching when tapping the facial nerve is a classic sign of hypocalcemia.
(E) Constipation: Hypocalcemia is associated with diarrhea, not constipation.
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