Inheritance of blood group is a condition of
(a) Codominance
(b) Incomplete dominance
(c) Multiple allelism
(d) Dominance.
ABO blood group is best example to Codominance, Incomplete dominance and Dominance.
Codominance – expression of phenotypes of both parents is called codominance.
Multiple allelism – Presence of more than two alleles for a gene is called Multiple allelism.
Dominance – expression of one allele in pair of contrasting characters, in heterozygous organisms is called Dominance.
So, the correct option is ‘a,c and d’.