lec11 - Lecture 11 Linkage Mapping/Recombination I....

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Lecture 11 – Linkage Mapping/Recombination I. Discovery of linkage A. Unusual results from cross: - cross  P/p∙L/l  X  P/p ∙ L/l   (Note: this P is different from P we’ve encountered previously) P =purple p  = red L  = long pollen l  = round pollen Phen (gen) observed expected purple, long ( P/– ∙ L/— ) purple, round ( P/– ∙ l/l ) red, long ( p/p ∙ L/–) red, round ( p/p ∙ l/l ) - so what’s going on here? B. linkage -  - remember that unlinked genes show independent assortment WwGg  X  WwGg W-G- W-gg wwG- wwgg - if genes completely linked, they assort as one AB / ab  X  AB / ab AB / AB AB / ab ab / ab - independent assortment applies to unlinked genes WwGg  X  WwGg       W-G-      W-gg      wwG- 1
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Picture 13 Picture 12 Picture 14 Picture 15     wwgg - What about linked genes?
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lec11 - Lecture 11 Linkage Mapping/Recombination I....

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