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Concepts from Lecture 24

Concepts from Lecture 24 - Appearance of new niches(shallow...

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Speciation and phylogeny Biological species concept does not apply to things we cannot observe for successful mating (fossils, asexual organisms, organisms where little is know about reproduction) Speciation can occur in allopatry – where the populations are physically separated by a geographic barrier Examples – deep river gorge prevents gene flow between squirrel populations Sympatry – where the populations are in the same area Examples of how this can occur: Non‐random mating (big insects mate with big ones, small ones mate with small ones) Chromosome copy number differences: Autopolyploidy & Allopolyploidy
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Unformatted text preview: Appearance of new niches (shallow or deep water of a lake) Sexual selection where females are choosy Phylogeny – tree representation of how organisms are related. Systematics – study of diversity and relationships between organisms Fossil record, made up of strata Homology vs Analogy – homology is similar because of descent from common ancestor, analogy is similarity due to convergent evolution Homoplasy = Analogy (convergent evolution) Fossils can be used to study homologies between present day and ancient organisms...
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