Slide set 9 - Non-mendelian genetics

exceptions to mendelian inheritance

incomplete dominance, codominance, epistasis, poygenic inheritance, linkage

incomplete dominance

two versions of dominant alleles for a certain gene, which can be passed down to combine (ie pink flowers)

codominance

both alleles of a gene can be expressed simultaneously (ie blood type: two types of carbohydrates on red blood cell exterior)

Epistasis

multiple genes interact to produce a phenotype (ie pigment gene and pigment protein gene)

polygenic inheritance

a large variety of genes affect a phenotype (ie height controlled by 180 genes)

multifactorial

influenced by environmental factors as well as genes (ie hydrangea color influenced by pH of soil)

linkage

two genes on the same chromosome tend to be inherited together: linkage increases with proximity of loci on chromosome

recombinant frequency

percentage of the time where crossing over separates linked genes, leading to new combinations of alleles