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Multiple alleles control inheritance of

1. phenylketonuria
2. colour blindness
3. sickle cell anaemia
4. blood groups

Correct answer: blood groups

Solution

ABO blood groups are controlled by multiple alleles: IA, IB, and i. These alleles combine in different ways to produce A, B, AB, and O blood types, which is why this is the standard example of multiple-allele inheritance.

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