Complex Patterns of Inheritance

Determining Gender Gender is determined by the sex chromosomes. Males are XY Females are XX

Incomplete Dominance Phenotype of heterozygous individual is a mix between the dominant and recessive trait. Example: Red (RR) flower and white (rr) flower produce pink flower (Rr).

Codominance Heterozygous genotype will express both alleles equally. Ex: in blood types, A and B are codominant, O is recessive Type A = AA or AO Type B = BB or BO Type AB = AB Type O = OO

Polygenic trait Controlled by two or more genes. Ex: eye color, skin color, fingerprints

Multiple Alleles 3 or more different forms of a gene. Ex: hair color (blonde, red, black, brown, etc.)

Linked Genes Genes located on the same chromosome, tend to be inherited together. The closer the two genes are, the more likely they will be inherited together.

Sex Linked Trait Trait is determined by a gene on a sex chromosome.