$ABO$ blood grouping is controlled by gene I which has three alleles and show codominance. There are six genotypes. How many phenotypes in all are possible?
Six
Three
Four
Five
In short horned cattle, genes for red $(R)$ and white $( r )$ coat colour occur. Cross between red $(RR)$ and white $(rr)$ produced $(Rr)$ roan. This is an example of
The most popularly known blood grouping is the $ABO$ grouping. It is named $ABO$ and not $ABC$, because ' $O$ ' in it refers to having
A man with blood group $B$ marries a women with blood group $A$ and their first child is having blood group $B$. What is the genotype of child
A child has blood group $O .$ If the father has blood group $A$ and mother blood group $\mathrm{B},$ work out the genotypes of the parents and the possible genotypes of the other offsprings.
In heterozygous condition, the individual expression of both the alleles in the phenotype is exemplified by