BS 162 1nd Edition Lecture 8 Epistasis Standing Upon One gene affects the action of another gene at a different locus Polygenic Inheritance gene 1 protein gene 2 protein gene 3 protein Multiple genes determine a protein and all together determine single trait Examples height weight longevity etc Polygenic traits are usually continuous not discrete or count data How do organisms make melanin Tyrosine dopa either pheomelanin or eumelanin pheomelanin red yellow uemelanin brown black Phenotypic Plasticity The ability of an organism to change its phenotype behavior morphology physiology etc during its lifetime occurs in response to the environment allows organisms to respond to variation in the environment might be adaptive in some contexts and not in others The ability to change skin color in response to the environment is a genetic trait Phenotype genotype environment Types of Inheritance Patterns autosomal dominant autosomal recessive sex linked mitochondrial DNA inherited from mother can be used to track maternal lineages These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute y gene inherited from the father can be used to track paternal lineages