Question

Multiple alleles control inheritance of

• A. phenylketonuria
• B. colour blindness
• C. sickle cell anaemia
• D. blood groups.

Answer 1

Answer: (D)

ABO blood group system is due to multiple allelism. A gene can have more than two alleles or allelomorphs, which can be expressed by mutation in wild form in more than one ways. These alleles or allelomorphs make a series of multiple alleles. The mode of inheritance in case of multiple alleles is called multiple allelism. A well known and simplest example of multiple allelism is the inheritance of ABO blood groups in human beings. In human population, 3 different alleles for this character are found - I^A I^B and I^o. A person is having only two of these three alleles and blood type can be determined.