Complex Pattern of Inheritance
Offspring phenotype : The more alleles you have the more gene combination are possible. One allele for the trait was dominant and prevents the other, recessive, allele from being expressed
Example : gene of the ABO blood group system - Found on platelets, epithelium, and cells other than erythrocytes, AB antigens (as with other serotypes) can also cause an adverse immune response to organ transplantation.
human- leukocyte-associated antigen (HLA) genes- controlled by genes located on chromosome 6.
Offspring phenotype : a mixture or blending of the two
Example : A snapdragon flower that is pink as a result of cross-pollination between a red flower and a white flower when neither the white or the red alleles are dominant.
Offspring phenotype : both traits are expressed equally.
Example : chicken and roan horse
Offspring phenotype : Patterns of inheritance that can be measured quantitatively
Example : human skin color and height