Question

Which of the following is true wrong about ABO blood group?

(a) It determines the antigen on RBC

(b) Some people may secretes a soluble form of this

(c) Secretors have se/se gene combination for secretion locus

(d) Non- secretors don’t produce this soluble form

I got this question in a national level competition.

My query is from Multiple Alleles topic in division Extension and Deviation from Mendelian Genetic Principles of Cytogenetics

Answer 1

Correct choice is (c) Secretors have se/se gene combination for secretion locus

For explanation I would say: Secretors is a dominant phenotype hence Se/Se and Se/se are both secretors, while the genotype in option c se/se is for non-secretors. The rest of the options are true.