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Lecture 48

BIOL 1000 Lecture 48: Lecture 48

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Biological Sciences
BIOL 1000
Kevin G.Scott

o982 E.g. change in insects exposed to pesticides & change in beak depth of Galapagos finches 3) Disruptive selection = occurs when environmental conditions vary in a way that favours  individuals at BOTH ends of phenotypic range over individuals with intermediate phenotypes Can lead to 2 or more contrasting phenotypes in the same population Chapter 15: Speciation and Phylogeny The Origin of Species is the Source of Biological Diversity Most of Darwin’s theory of evolution focused on the role of natural selection in the gradual  adaptation of a population to its environment Microevolution = changes in the gene pool of a population from one generation to the next Speciation = process by which one species splits into 2 or more species E.g. flightless vs. flying birds of same species When one species splits into 2, new species share many characteristics because they descended from a common ancestor  There are Several Ways to Define a Species Species comes from Latin word for “kind” or “appearance” Biological species concept defines a species as:  = A group of populations whose members have the potential to interbreed in nature and produce fertile offspring Reproductive isolation = prevents genetic exchange (gene flow) and maintains the gap between species  Members of different species do not usually mate with each other Certain pairs of clearly distinct species do occasionally interbreed, resulting in a hybrid E.g. grizzly bears sometimes mate with polar pair, resulting in the hybrid grolar b
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