Explain with the help of a suitable example the inheritance of a trait where two different dominant alleles of a trait express themselves simultaneously in the progeny. Name this kind of inheritance pattern.

Explanation

This can be explaind by studying the inheritance of ABO blood group in a progeny born to parents heterozygous for blood group A and blood group B.
e.g : Father Heterozygous for blood group. A.
`darr`
`"Genotype " : I^(A)i`
`darr`
Mother Heterozygous for blood group B.
`"Geneotype " : I^(B)i`
On Crossing
`{:(, I^(A), i), (I^(B), I^(A)I^(B), I^(B)i), (i, I^(A)i, ii):}`
In this cross, progeny with blood group AB is produced resulting from the simantaneous expession of dominant alleles `I(A) " and " I^(B)`. This pattern of inheritance is called Co-dominance.