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Q.

Consider the following statements about the ABO blood grouping in human beings and select the incorrect pair from the given options a. ABO blood groups are controlled by gene I, having three alleles IA, IB and i.b. IA and IB are completely dominant over i but IA and IB show incomplete dominance when they are present togetherc. The alleles IA and IB produce almost similar form of sugar but the i allele produce a completely different sugard. A total of six different genotypes and four phenotypes are possible

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a

a and b

b

b and c

c

a and d

d

c and d

answer is B.

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Detailed Solution

1. When IA and IB are present together, they both express their own types of sugars, this is because of co-dominance.2. The alleles IA and IB produce a slightly different form of the sugar, while i does not produce any sugar.
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