BIOA02H3 Lecture Notes - Lecture 26: Inbreeding Avoidance, Circadian Clock, Exocrine Gland
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BIOA02H3 Full Course Notes
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Hormone: chemical substance secreted in 1 pt of body that causes (longer-lasting/ more widespread) ch/repsonse in other body pts. Endocrine gland: ductless gland that pdc hormone -> carried by blood to (distant) target (x exocrine gland e. g. pdc saliva, sweat) Bird: male sing so much @ spring cuz a ected by photo period daylight length & testostrone revs up (hormonal in uence on lizard"s behaviour) 1. X male = 80% female reproductively active 2. 1 male = 100% reproductively active female 3. Castrated male = 80% cuz male x display courtship behaviour -> x a ect female"s reproductive readiness 5. 1 castrated male injected w/ testosterone = 100% cuz male display courtship behaviour. Have 5 cuz remove reproductive organ of male = remove multiple hormones -> re- inject 1 spec hormone = ensure it"s that hormone which causes di in behaviour (rescued behaviour) Rover larvae vs sitter larvae = travel between patches vs x.
