Question

If two person with ${}^{\prime }A{B}^{\prime }$ blood group marry and have sufficiently large number of children, these children could be classified as ${}^{\prime }{A}^{\prime }$ blood group. ${}^{\prime }AB$ blood group ${}^{\prime }{B}^{\prime }$ blood group in $1:2:1$ ratio.
Modern technique of protein electrophoresis reveals presence of both ${}^{\prime }{A}^{\prime }$ and ${}^{\prime }{B}^{\prime }$ type proteins in ${}^{\prime }A{B}^{\prime }$ blood group individuals. This is an example of

• A. Codominance.
• B. Incomplete dominance.
• C. Partial dominance.
• D. Complete dominance.

Answer 1

The correct option is A Codominance.

$AB$ blood group is characterised by the presence by the presence of both antigen $A$ and $B$ i.e, $I^A$ and $I^B$ over the surface of RBCs.
'Here both alleles are able to express themselves forming antigens $A$ and $B$. This is called as codominance.