{ "nid": "55", "details": "\x3cspan class=\"title\"\x3eEcoBeaker: Islands and Natural Selection\x3c/span\x3e\x3cbr/\x3e\n\x3cspan class=\"description\"\x3eThis laboratory explores how selection can act on two multi-locus traits as the selection regime changes. The example used is beak length and depth of Darwin\'s finches in wet and dry environments. Students first change the optimal length and/or depth and selection strengths towards those optima and watch what happens to the average beak length and depth in the population. They then try correlating the two traits, either positively or negatively, to see how trait correlation can change the outcomes from selection. In the final two sections of the lab students try to manipulate a population so it will split into two subpopulations when an island is split in half, one side wet and the other dry, or when the weather regime varies from year to year between wet and dry. This and Sickle-Cell Alleles are our two most popular labs for introductory evolution courses.\r\n\x3c/span\x3e\x3cbr/\x3e\n\x3cbr/\x3e\n\x3cstrong\x3eLevel\x3c/strong\x3e: Intro or advanced\x3cbr/\x3e\n\x3cstrong\x3eKey Concepts\x3c/strong\x3e: Natural selection; Speciation\x3cbr/\x3e\n\x3cstrong\x3eCourses\x3c/strong\x3e: Evolution; Intro Bio: Eco/Evo/Genetics; Natural Selection\x3cbr/\x3e\n          \x3cbr/\x3e\x3ca href=\"/search_result_details/brief/55\" class=\"node_brief\"\x3eRead less\x3c/a\x3e        \x3cbr/\x3e\x3ca href=\"/cart/add/55?dest=search_result_details%2F55\x26amp;dest_query=\"\x3e + Add to course collection\x3c/a\x3e  \x3c/span\x3e \x3c!-- description --\x3e\n" }