Question

abo blood groups in humans are controlled by the gene i. there are six different genotype and four different phenotype in human population. what is the ratio of allele in sperm and population? (1) 1 : 1 (2) 1 : 3 (3) 1 : 2 (4) 3 : 1

Answer 1

I think it's the 3rd one

Answer 2

No. of alleles present in the population which controls the ABO grouping is 3 which are; 1) IA , 2)IB & 3) i.

And in one single sperm there will single allele coming from the father which will contribute and determine the offspring's blood group. It could be any one from the above mentioned three.

Thus if there is 1 allele in a sperm and 3 in total population the ratio will be 1:3 (2).