Question

What are the possible genotypes of an individual having blood group ‘A’?

• A. $I^A{I}^A$
• B. $I^A{I}^B$
• C. $I^A{I}^A$or
  $I^A{I}^O$
• D. $I^A{I}^O$

Answer 1

Answer: (C)

• In ABO blood group system an individual can have any two of these three different alleles - IA, IBandIO.
• Of the three alleles, IA and IB are codominant in nature whereas IO is recessive.
• The table below represents the possible genotypes of various blood groups:

Column I ColumnII A IA IA and IA IO B IB IB and IB IO AB IA IB O IO IO