kodominanciát

Kodominancia is a genetic phenomenon where two different alleles for a gene are both expressed equally in the phenotype of a heterozygous individual. This means that instead of one allele masking the other, as in simple dominance, both traits associated with the alleles are visible. For example, in the ABO blood group system, individuals with the AB blood type are heterozygous for the A and B alleles. Both the A antigen and the B antigen are produced on the surface of their red blood cells, making both alleles codominant.

Another common example is found in some flower colors. If a flower can have red petals (controlled by allele R) or white petals (controlled by allele W), and a plant is heterozygous for both alleles (RW), a codominant expression would result in petals that are not pink (which would be incomplete dominance) but rather have patches or streaks of both red and white. The genetic makeup of the organism clearly shows the influence of both alleles contributing to the observable characteristics. Kodominance is a deviation from simple Mendelian inheritance patterns and highlights the complexity of gene expression.