complex patterns of inheritance
by: dustin patton
multiple alleles
definition: three or more alternative or allelic forms of genes, only two of which can exist in any normal diploid individual
offspring phenotype: there are more than two alleles in phenotype
example: ABO blood group system, human leukocyte associated antigen HLA genes humans are controlled by three alleles iA, iB, iO
incomplete dominance
definition: refers to genetic situation in which one allele does not completely dominate another allele
offspring phenotype: if two homozygous are blended together is will basically be heterozygous
example: long tailed dog, blue bird, brown rat, light skinned person
codominance
definition: relationship between two versions of gene
offspring phenotype: has 3 phenotypes
example: red, roan(red + white spots) , white
polygenic traits
definition: one whose phenotype is influenced by one or more gene
offspring phenotype: expressed in a range
example: human height, skin color