Multiple Choice
What type of inheritance is demonstrated when two alleles result in a blending of traits in the offspring?
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13. Mendelian Genetics
Incomplete Dominance vs. Codominance
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Which blood type is an example of codominance?
A
A
B
B
C
AB
D
O
Verified step by step guidance1
Understand the concept of codominance: Codominance occurs when two different alleles are expressed equally in the phenotype of an organism. Neither allele is dominant or recessive, and both contribute to the organism's traits.
Identify the alleles involved in human blood types: The ABO blood group system is determined by the presence of antigens on the surface of red blood cells. The alleles are A, B, and O, where A and B are codominant, and O is recessive.
Examine the blood type AB: In individuals with blood type AB, both A and B antigens are present on the surface of red blood cells. This is because the A and B alleles are codominant, meaning both are expressed equally.
Compare with other blood types: Blood type A has only A antigens, and blood type B has only B antigens, each resulting from the presence of a single dominant allele. Blood type O has neither A nor B antigens, as it results from two recessive O alleles.
Conclude that blood type AB is an example of codominance: Since both A and B alleles are expressed equally in the phenotype, blood type AB is a classic example of codominance in genetics.
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