FA2011lecture22

FA2011lecture22 - H 2 = V g /V t (where V t = V g + V e )...

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Unformatted text preview: H 2 = V g /V t (where V t = V g + V e ) measures the response to selection, and represents V a /V t where V g = V a (additive) + V d (dominant) + V i (epistasis) h 2 = selection gain/selection differential = (Y o Y)/(Y p Y) If all alleles act semi-dominantly and no epistatic effects are occurring so all V g is V a , then H 2 = h 2 . If some alleles that could potentially affect the trait are recessive of if some genes involved are epistatic to others, then H 2 > h 2 . Usually cannot measure both broad sense and narrow sense heritability for the same trait, but if you could... measures the proportion of phenotypic variance due to genetic factors QTL (quantitative trait locus): a chromosomal region contributing to the genetic control of a quantitative trait Low pulp line High pulp line QTL mapping example: identi cation of loci (genes) affecting tomato pulp content L QTL L L QTL L pulp content: low pulp content: high X Low pulp line High pulp line pulp content: intermediate self F2 with 1 non-rec. + 1 recomb. chrom. F2 with 2 rec chromosomes F2 with 2 non-rec....
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This note was uploaded on 01/16/2012 for the course BICD 100 taught by Professor Nehring during the Fall '08 term at UCSD.

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FA2011lecture22 - H 2 = V g /V t (where V t = V g + V e )...

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