Systematics: Seeking Order Amidst Diversity Chapter 18.

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Systematics: Seeking Order Amidst Diversity Chapter 18

Naming and classification  System devised by Carolus Linnaeus Originally based on similarities  After Darwin, systematists sought to classify based on phylogeny relatedness/ ancestry  Note how genus and species are written Genus only is capitalized Entire name is underlined or italicized

Naming and classification  Anatomy, often at the microscopic level, is important in systematics Snail’s “radula” Setae of marine wormPollen grains

Naming and classification  Molecular similarities are useful in reconstructing phylogenies Example: comparison of human and chimp chromosomes.  Similarities in banding patterns note similarity in genes present.

What are the domains of life?  Three domains are now well-accepted The two groups of prokaryotes are considered different enough to place in two separate domains.  Molecularly, more different from each other than each group within the Eukarya

What are the domains of life?  Kingdoms are represented by the branches off the main trunks. Kingdom level classification still in flux.

Why do classifications change?  New information is discovered. Especially DNA- based information  Example: Red wolves DNA analysis shows this “species” is likely a cross between gray wolves and coyotes. Image courtesy of Defenders of Wildlife

Why do classifications change?  Biological species concept is difficult to apply… The phylogenetic species definition is an alternative:  The smallest diagnosable group that contains all the descendents of a single common ancestor. Each branch of the diagram is a species

Proposed phylogeny of HIV  Based on analysis of RNA sequences (HIV has RNA but no DNA)  Note the two distinct groupings of HIV in humans HIV-1 is a somewht distant relative of HIV-2. Each is more closely related to different SIVs in different primates.  How could this information be useful to humans?

How many species exist?  Mean estimate: 7-10 million  High estimate: 100 million  Current named species: 1.5 million 5% prokaryote and protists 22% plants and fungi 73% animals

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