Identify the incorrect statement regarding the gene '$I$' that controls the $ABO$ blood grouping.

  • A
    The gene '$I$' has three alleles.
  • B
    $A$ person possesses only two of the three alleles.
  • C
    When $I^A$ and $I^B$ are present together,they express the same type of sugar.
  • D
    The allele '$i$' does not produce any type of sugar.

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Explain the concept of multiple alleles.

In which of the following can multiple alleles be observed?

Considering the concept of multiple alleles,one individual can have only . . . . . . alleles for that character.

What is the possible blood group of children whose parents are heterozygous for $A$ and $B$ blood groups?

If a child has $O$ type of blood group and the father has $B$ type,the genotype of the father will be:

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