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A mother with a certain trait has four soms and one daughter. All of her sons have this trait and her daughter is a carrier. This is likely due to an inheritance pattern that is: a. dominant/recessive
b. X-inked c. incomplete dominance codominance
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b. X-linked (recessive)
Explanation: An affected mother with an X‑linked recessive trait would be XrXr. Mating with a normal father (X+Y) gives sons XrY (affected) and daughters X+Xr (phenotypic carriers). This fits all sons affected and the daughter a carrier. Autosomal dominant/recessive or incomplete/codominance do not produce that sex‑specific pattern.
Explanation: An affected mother with an X‑linked recessive trait would be XrXr. Mating with a normal father (X+Y) gives sons XrY (affected) and daughters X+Xr (phenotypic carriers). This fits all sons affected and the daughter a carrier. Autosomal dominant/recessive or incomplete/codominance do not produce that sex‑specific pattern.
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