1.

ABO blood groups in human beings are controlled by the gene `I`. The gene `I` has three alleles `- I^(A),I^(B)` and `i`. Since there are three different alleles, six different genotypes are possible How many phenotypes can occur ?A. SixB. TwoC. ThreeD. Four

Answer» Correct Answer - D
In human beings ABO blood groups are controlled by gene `I` which has three alleles `I^(A),I^(BV)` and `I`. The six possible genotypes are `I^(A)I^(A),I^(A)I^(B),I^(A) I,I^(B)I^(B),I^(B) i` and `ii`. He phenotypes which occur by these genotypes are `A(I^(A)I^(A),I^(A)i),B(I^(B)I^(B),I^(B)i),AB(I^(A)I^(B))` and `O(ii)`.


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