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Download Heredity Lecture -Epistasis, Polygenic and Sex
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Transcript
Epistasis: "To Stand Upon" - An Override Gene Multiple Genes – Polygenic Inheritance A single trait can be produced by a combination of many genes. Polygenic from the Greek words polys, meaning “many” and genos meaning “kind”. Polygenic inheritance is the inheritance pattern of a trait that is controlled by two or more genes. The genes may be on the same chromosome or on different ones. Each gene may have two or more alleles. Height in humans is an example of polygenic inheritance Four genes contribute to height. Each gene has two alleles that contribute to the trait. When heights of the offspring are graphed; a bell shaped distribution curve is formed. Intermediate heights occur most often. *Pigment is also a polygenic trait in humans Polygenic Inheritance Po; Sex-link Inheritance
