2-03-09 - 2/03/09 Relationshipbetweengenotypeandphenotype

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2/03/09 Relationship between genotype and phenotype A. Two broad categories of phenotypic variation 1. traits showing discontinuous phenotypic variation (only a few phenotypes). a. typically one gene is the basis for the phenotype 2. traits showing continuous variation (great variety of phenotypes) a. multiple genes interact to produce the genetic basis for continuous variation.  These traits are polygenic. polygeny- two or more genes that interact with one  another to produce the phenotype B. Formula for estimating the number of genotypes # of genotypes = ((a)(a+1))/2)G >>>> (G is an exponent!) a = # of alleles of a gene G = # of genes ^^^^^^^^^^^Know this formula for the test^^^^^^^^^^^^ example: seed texture: R, w # = ((2)(3)/2) = 3 RR, Rw, ww any type of trait: 10 genes ; each has 2 alleles # = ((2)(3)/2)) (raised to the 10th power) = 59,000 C. Heritability
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2-03-09 - 2/03/09 Relationshipbetweengenotypeandphenotype

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