Complex Patters of Inheritance
Kyla Luangkhot
Multiple Alleles
Traits are controlled by more than two alleles.
There are 3 possible phenotypes.
Ex) blood types ; A, B, AB, & O. There are 3 alleles for the gene that determines blood type.
Incomplete Dominance
Neither gene is expressed with another allele.
Offspring that are heterozygous is usually hybrid between the homozygous parents.
Ex) A red tulip & a white tulip are cross pollinated they result in a pink tulip, A red bird and blue bird mate and their offspring is purple.
Codominance
Both alleles are completely expressed if 2 alleles have a codominance relationship.
Offspring that are heterozygous are equally expressed.
Ex) Person with type AB blood, both A and B allele are equally expressed, If a person has type A protein they have type A blood.
Polygenic Traits
Trait is controlled by 2 or more genes.
Phenotypes are not shown, though each of the genes contributing to the trait is inherited.
Ex) Height, skin color, eye color, & weight.