Polygenetics - Many polygenes are regulatory in nature and...

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POLYGENIC INHERITANCE A trait can be the effect of several independently-assorting gene loci. Each locus may be an  active  allele which  contributes to the phenotype  or an  inactive  allele that  does not contribute to the phenotype . Polygenic alleles lack dominance, the overall phenotype being the  cumulative  effect  of all active alleles.  Polygenes, like other genes, segregate and independently sort according to  Mendelian principles.
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Unformatted text preview: Many polygenes are regulatory in nature and can be influenced by changes in the environment. They exhibit a wide and continuous range of expression. ** Polygenic traits are studied in populations not pedigrees. The number of genes (n) contributing to a polygenic trait can be estimated from the number of phenotypes observed: The # of phenotypes = 2n + 1...
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This note was uploaded on 05/03/2008 for the course BIO 2322 taught by Professor Spotswood during the Spring '08 term at The University of Texas at San Antonio- San Antonio.

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