(A) In blood group $AB$,the alleles for both antigens,$A$ $(I^A)$ and $B$ $(I^B)$,are expressed equally and independently,resulting in the genotype $I

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(A) In blood group $AB$,the alleles for both antigens,$A$ $(I^A)$ and $B$ $(I^B)$,are expressed equally and independently,resulting in the genotype $I^A I^B$ (phenotype $AB$).Since both alleles express themselves simultaneously in the heterozygote,this phenomenon is known as co-dominance.

Class 12 Biology Principles of Inheritance and Variation Codominance

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Formation of $AB$ type of blood group in humans is due to . . . . . . inheritance.

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A
co-dominance
B
incomplete dominance
C
complete dominance
D
pleiotropy

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Principles of Inheritance and Variation

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Codominance

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Formation of $AB$ type of blood group in humans is due to . . . . . . inheritance.

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$A$ roan bull is crossed with three cows. Cow $A$ has the same genotype as the roan bull,cow $B$ is red,and cow $C$ is white. What should be the proportion of roan offspring in each group of cows?

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