BIOB51H3 Lecture Notes - Lecture 14: Medium Ground Finch, Daphne Major, Kohlrabi
5 Apr 2020
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A system of interacting genes, transcription factors, promotors, rna, and other molecules is: regulatory network. What happened first in the evolution of snake venom: duplication of the defensin gene. The condition that occurs when a mutation that causes beneficial effects for one trait also causes detrimental effects on other traits is called: antagonistic pleiotropy. Galapagos archipelago: volcanic islands, 4. 2 mya, first finch 1mya, now 18+ species, darwin studied for 5 weeks. Peter and rosemary grant: 40+ year study in galapagos, isla daphne major. Isla daphne major: small, no introduced animals (e. g. goats). Medium ground finch: generalist seed feeder efficiency at eating, variation in beak size influences different types of seeds. Beak width and depth are highly heritable: h2 beak depth=0. 90, h2 beak length=0. 65, rmbr r=h2s. Beak size evolution: severe drought in 1977: only harder, woody seeds available to birds, result: larger-beaked birds favoured.
