Question

Multiple alleles control inheritance of(a) phenylketonuria(b) colour blindness(c) sickle cell anaemia(d) blood groups

Answer 1

Answer:

The correct answer is d) blood groups

Explanation:

Blood group inheritance is controlled by three alleles and these alleles are IA, IB, and i. A person can have two alleles out of three alleles which determines the genotype and phenotype of the person blood group. One allele comes from father and the other comes from mother.

In these three alleles, IA and IB is dominant allele and i is recessive allele that means if A and B allele come together then the offspring blood group will be AB. If a person have alleles IAi then the blood group would be A and if the person has alleles IBi then the blood group of the person will be B.  

The person will have an O blood group if he/she is having a pair of recessive allele i.e., ii. Therefore the correct answer is d) blood group.

Answer 2

Multiple alleles control the ‘inheritance’ of blood groups.

Option: (d)  

Explanation:  

• Blood group of an individual is governed by a set of alleles that transfer the characters from one individual to their progeny; there are three alleles that are the A, B and O that are present in the blood group of individuals.  

• Amongst that the A and the B are dominant alleles whereas the O is a ‘recessive allele’.

• The antigens that are expressed on top of the RBCs are due to these allelic characteristic.  

Learn more about blood groups

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