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

• Correct answer
  A

  codominance
• B

  incomplete dominance
• C

  partial dominance
• D

  complete dominance

Solution

In codominance both alleles of a pair express themselves fully in $F_1$ hybrid. It is contrary to the situation seen in incomplete dominance, where traits express themselves only partially. This is not the example of partial dominance or complete dominance

Hence, the correct answer is option: 'A'.