Home Physics NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 9 PCB Which of the following is correct about dise…
Physics NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 9 PCB MCQ (Single Correct)

Which of the following is correct about diseases and their features?

A
Colour blindness occurs in only about 0.4 per cent of males and about 8 per cent of females as the gene is present on the X chromosome.
B
The family pedigree of Queen Victoria shows a number of haemophilic descendants, as she was a carrier of the disease.
C
Mutant haemoglobin molecules undergo polymerisation under high oxygen tension, causing the change in the shape of RBCs from biconcave discs to elongated sickle-like structures.
D
Phenylketonuria results in the accumulation of tyrosine, which leads to mental retardation and a reduction in hair and skin pigmentation.

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The correct answer is:
B

Colour blindness occurs in about 8 per cent of males and only about 0.4 per cent of females. Mutant haemoglobin molecules undergo polymerisation under low oxygen tension, causing the change in the shape of RBCs. from biconcave discs to elongated sicklelike structures. Phenylketonuria results in the accumulation of phenylalanine, which leads to mental retardation and a reduction in hair and skin pigmentation.

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