F13 lecture 19 v3

Insights from ar0cial selec0on most traits respond

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

Ask a homework question - tutors are online