Blood type in humans is determined by the type of carbohydrate present on the red blood cells.A red blood cell may have carbohydrate A (IA), carbohydrate B (IB), or no carbohydrate (i).Carbohydrate A and carbohydrate B are codominant to each other and both A and B arecompletely dominant to the allele for no carbohydrate.7. How many phenotypes are possible for this situation?
Question
Blood type in humans is determined by the type of carbohydrate present on the red blood cells.A red blood cell may have carbohydrate A (IA), carbohydrate B (IB), or no carbohydrate (i).Carbohydrate A and carbohydrate B are codominant to each other and both A and B arecompletely dominant to the allele for no carbohydrate.7. How many phenotypes are possible for this situation?
Solution
There are four possible phenotypes for this situation. They are:
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Blood Type A: This phenotype occurs when the individual has either two A alleles (IAIA) or one A and one i allele (IAi).
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Blood Type B: This phenotype occurs when the individual has either two B alleles (IBIB) or one B and one i allele (IBi).
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Blood Type AB: This phenotype occurs when the individual has one A and one B allele (IAIB). Since A and B are codominant, both are expressed.
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Blood Type O: This phenotype occurs when the individual has two i alleles (ii). Since i is recessive to both A and B, it is only expressed when no A or B alleles are present.
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