type of inheritance with a third phenotype with a heterozygous genotype, where both of the traits are expressed equally (ie type A x type B = type AB blood
This type of inheritance is known as codominance. In codominance, two different alleles for a gene are both expressed in the phenotype when they are present in a heterozygous individual. This results in a third phenotype that shows the characteristics of both alleles equally. An example of codominance is the ABO blood group system in humans, where individuals with both A and B alleles have type AB blood.
