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Q.

ABO blood grouping is controlled by gene I which has three alleles and show co - dominance . There are six genotypes . How many phenotypes in all are possible ?

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a

Three

b

Six 

c

Five

d

Four 

answer is C.

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Detailed Solution

4 types of phenotypes of blood groups are possible, like A, B AB and O groups.Since allele ia and ib show dominance and co-dominance.Allele io is recessive.

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