Traits can be affected by one gene and can be influenced by the environment. Human blood types are controlled by two non-Mendelian patterns of inheritance. These two patterns are?

Answer 1

Human blood types are controlled by two non-Mendelian patterns of inheritance: codominance and multiple alleles.

1. Codominance: In the context of blood types, codominance occurs with the ABO blood group system. The alleles A and B are both expressed when they are present together (genotype AB), resulting in the AB blood type, where both A and B antigens are present on the surface of red blood cells.

2. Multiple alleles: The ABO blood group system also demonstrates multiple alleles, meaning that more than two alleles contribute to the phenotype. In this case, there are three main alleles: A, B, and O. The presence of these alleles and their combinations determines an individual's blood type (A, B, AB, or O).

Together, these patterns help explain the variability and inheritance of blood types in the human population.