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Q.

Given below is the pedigree analysis of a family represents the inheritance of a genetic trait.  Identify the disorder.

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a

Phenylketonuria 

b

Sickle cell anaemia

c

Thalassemia 

d

Colourblindness

answer is B.

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Detailed Solution

Criss cross inheritance is exhibited. It is an X-linked recessive disorder and so it is colour blindness.

All the sons of colourblind woman are colourblind. 

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