Secretions from which one of the following are rich in fructose, calcium and some enzymes?

ABO blood grouping is controlled by gene I which has three alleles and show co-dominance. There are six genotypes. How many phenotypes in all are possible -

Study the pedigree chart of a certain family given below and select the correct conculusion which can be drawn for the character –

A cross in which an organism showing a dominant phenotype in crossed with the recessive parent in order to know its genotype is called -