Question

Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.

• A. When $I^A$ and $I^B$ are present together, they express same type of sugar
• B. Allele ‘i’ does not produce any sugar
• C. The gene (I) has three alleles
• D. A person will have only two of the three alleles

Answer 1

The correct option is A When $I^A$ and $I^B$ are present together, they express same type of sugar

When $I^A$ and $I^B$ are present together they both express their own different types of sugars, because of co-dominance. $I^A$ will express A type while $I^B$will express B type. Hence, red blood cells have both A and B types of sugars and this type of blood group is referred as AB type.

All other options are true. So, correct option is a.