complete
allele is expressed in both homozygous dominant and heterozygous conditions
incomplete
alleles exhibit a phenotype intermediate between those with homozygous alleles (blending)
codominance
phenotype associated with each allele is expressed in heterozygote (shows both)
pleiotropy
when one allele influences many traits (one gene causes multiple effects on phenotype)
polygenic
one trait affected by many genes
epistasis
a gene at one locus alters the phenotypic expression of a gene at a second locus
Morgan
discovered X-linked traits
x-linked traits
traits that are carried only on X chromosome
gene linkage
genes found close together on a chromosome tend to stay together
linked genes
genes found on same chromosome