Which one of the following is a sex-linked disease?
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Beri beri
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Tylosis
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Albinism
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Colour blindness
D
Correct answer
Explanation
Color blindness (specifically red-green color blindness) is a sex-linked trait carried on the X chromosome. Males (XY) are more frequently affected because they have only one X chromosome. Beri beri is a vitamin deficiency, tylosis is an autosomal dominant condition affecting esophagus skin, and albinism is an autosomal recessive trait - none of these are sex-linked.