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a
Haemophilia- Sex linked recessive disease.
b
Cancer- Mostly due to chromosomal abberations.
c
Colour blindness- X linked recessive disorder.
d
Sickle cell anemia- Transition.
answer is D.
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Detailed Solution
Sickle cell anemia is caused by a transversion in which Purine is replaced by Pyrimidine or vice-versa: T is substituted for A in the gene for a hemoglobin subunit.