Extending Mendel's Laws

incomplete dominance

• heterozygous genotype results in blended phenotype

• both traits combine to form smth in between

• neither allele is dominant

• ex. red + white = pink

complete dominance

only one allele expressed despite presence of other allele

codominance

• both alleles expressed at same time

• mixed phenotype

• both traits dominant

• ex. red + white = red and white spots

T or F: environment affects traits

T

polygenic trait

range of phenotypes bc of additive effects of multiple genes