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Lecture 5

Lecture 5 species and speciation.docx

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Department
Biology
Course
BIOL 103
Professor
Peter T Boag
Semester
Winter

Description
Increased availability of objective markers of shared common ancestry from molecular sequences have increased the popularity of the ‘phylogenetic species concept’ Lecture 5 species and speciation • Island emerged out of ocean approx. 1.5 mil yrs • Finches arrive, genetic drift • Natural selection and genetic drift bc each island is different There are isolated • Gene flows are isolatepopulations of elephants oncies instead  of 1, many yrs later,  a lot of different species in the same place  not interbreeding 2 continents, but the What is a  • phylogenetic species species concept confirms no more How are they  • Gradually in situ or by more rapid division of ancestral  formed> population Populations within each species are too similar to • Usually allopatric sometimes in sympatry How do soecies  • Gene flow red
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