A) Syphillis
B) Hepatitis
C) Phenyketonuria
D) Colour blindness
Correct Answer: D
Solution :
Colour blindness is the inability of certain individuals to distinguish red from green colour. It is a recessive sex-linked trait i.e., the genes responsible for colour blindness are located on the X-chromosome (sex chromosome or allosome). The inability develops by lack of one of the primary cone pigments of the retina.
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