Codominance and multiple alleles. Hope i could help. :)
The inheritance of human blood types can best be described by the terms multiple alleles and codominance. Human blood type is determined by three alleles: IA, IB, and i. The IA and IB alleles are responsible for producing A and B blood group antigens, respectively, and are codominant, meaning that both antigens are equally expressed when both alleles are present, resulting in AB blood type. The I allele, which produces no antigen, is recessive to both IA and IB. Due to the presence of multiple alleles in the population, the ABO blood group system exhibits more variation than the simple dominant-recessive relationships observed in Mendel's peas.
A person can have different combinations of the three alleles across the two homologous chromosomes, leading to blood types A, B, AB, or O. For instance, type A blood can be either homozygous (IAIA) or heterozygous (IAi). Similarly, type B blood can be homozygous (IBIB) or heterozygous (IBi). AB individuals express both IA and IB alleles, and type O individuals have two recessive alleles (ii).
The inheritance of human blood types is best described by the terms multiple alleles and codominance, where multiple alleles allow for various blood types and codominance results in the expression of both A and B antigens in individuals with AB blood type. Each person inherits two alleles from three possible alleles: IA, IB, and i. Together, these concepts clarify the complexity of human blood type inheritance.
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