BIO 204- chapter 2

BIO 204- chapter 2 - Any group of species we designate or...

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Any group of species we designate or name is called a taxon ( humans, primates, mammals, vertebrates) Any taxon that consists of all the evolutionary descendants of a common ancestor is called a clade. Two species that are each other’s closest relatives are called sister species- similarly two clades that are each other’s closest relatives are called sister clades. Systematics is the study of biodiversity 4 billion year evolutionary history of life is known as the “ Tree of Life.” 1.7 million species have been formally described and named A trait that differs from its ancestral form is called a derived trait Derived traits that are shared among a group of organisms, and are viewed as evidence of the common ancestry of the group, are called synapomorphies. Convergent evolution and evolutionary reversal are two sources of homoplasy. A shared derived trait, used as the basis for inferring a monophletic group, is called a synapomorphy. Parsimony
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This note was uploaded on 02/15/2010 for the course BIO 204 taught by Professor O'neal during the Spring '07 term at SUNY Stony Brook.

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BIO 204- chapter 2 - Any group of species we designate or...

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