A man and a woman have a child together. The mother's blood type is type O and the child's blood type is type A What could the father's genotype be?

iAiA or iAi = Type A

Explanation:

Blood group in humans is controlled by a gene with multiple alleles. The alleles iA and iB are co-dominant over one another but dominant over allele i. In the blood type:

iAiA or iAi - type A

iBiB or iBi - type B

iAiB - type AB

ii - type O

According to this question, a man and a woman have a child together. The mother's blood type is type O (ii) and the child's blood type is type A (iAi). This means that the father's blood type must be a type A with genotype "iAiA or iAi".

answer; ///(b) it is composed of four protein chains and four heme groups;