BIOA02H3 Lecture Notes - Lecture 5: Elaiosome, Impatiens, Inbreeding Depression

• School: UTSC
• Department: Biological Sciences
• Course: BIOA02H3
• Professor: Effiette Sauer

Document Summary

Parents = sessile (immobile) (cid:0) parent-offspring competition for space/resources: to avoid this: seed dispersal. Problem: w/o seed dispersal adaptations, most seeds are deposited close to mother: parent-offspring competition for space, mating b/w closely related individuals (cid:0) inbreeding depression. Ex: jewelweed ( touch-me-not : grows in the ravine, unzips w/ the slightest touch (cid:0) curls (cid:0) flip (cid:0) twist, when opened (cid:0) seeds are catapulted away wind dispersal. Hairs / parachutes / wings (cid:0) to keep seed in the air for as long as possible. Ex: dandelion seeds branched out to give a better lift (easy to be blow away) Stays buoyant in water for as long as possible external hitchhiking. Uses hooks/barbs to disperse seeds away from parents. Ex: burdock ((cid:0) development of velcrow) internal hitchhiking. Ex: cherries when riped (cid:0) swallowed into the gut passage: relies on the gut passage (cid:0) acidity allows for germination (cid:0) pooped out somewhere ant dispersal.