F13 lecture 19 v3

Insights from ar0cial selec0on most traits respond

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Unformatted text preview: vulgaris) •  pin, thrum morphs are common •  homostyle morphs are rare •  thought to be caused by selec0on for increased outcrossing mechanisms of gene0c correla0ons in nature •  the two previous examples (morning glories and English primroses) – single Mendelian loci responsible for trait varia0on •  more commonly – quan0a0ve traits have polygenic gene0c bases –  mechanisms underlying correla0ons between these types of traits are not well known •  probably complex trying to dis0nguish between pleiotropy and gene0c linkage •  Conner (2002) – wild radish (Raphanus raphanistrum) –  two large (Ne=600) replicate popula0ons randomly mated in greenhouse for 9 genera0ons •  selec0on minimized by crossing design •  only very close gene0c linkage or pleiotropy should contribute to LD –  looked at phenotypic and gene0c correla0ons among 6 floral traits –  (see next slide) no significant changes in correla0ons were seen •  => correla0ons are likely due to pleiotropy or very close gene0c linkage Ar0ficial selec0on as a model of natural selec0on •  Long tradi0on (back to Darwin) •  Important to d...
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