One of the following is not an example of incomplete sex-linkage
A
Total colour- blindness
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B
Retinitis pigmentosa
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C
Nephritis
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D
Myopia
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Solution
The correct option is D Myopia
Myopia is also known as night blindness. This disease is inherited in an X-linked recessive pattern.
Hence one copy of an affected gene on the X chromosome in males is sufficient to result in myopia whereas females with both affected genes have the disease. Thus the correct answer is option D.