Blood Type and Allele Interactions

Multiple alleles can shape traits through blood type, sickle cell anemia, incomplete dominance, and codominance. Multiple allelism means a gene has three or more allelic forms. Diploid organisms, including humans, usually carry only two alleles for each gene, but many human genes exist in multiple forms in the population.

Genes can exist in different forms called alleles, and these alleles control variations in inherited traits.

Some genes have more than two alleles in a population, which creates multiple possible genetic combinations.

Even when many alleles exist in a population, each individual inherits only two alleles for a specific gene, one from...