Chapter 23 Flashcards
What are some common features all organisms share?
1.Composed of one or more cells
2.Use DNA to encode genetic information
3.Subject to evolutionary forces
4.Individual organisms live in populations
How many named species in the world?
How many do we estimate that are actually in the world?
1.5 million species
5-20 million
First person to start systematically classify organisms
Aristotle
Who developed the binomial system for naming organisms?
Carolus Linnaeus
Group that does not include common ancestors
Polyphyletic group
An ancestral character
Plesiomorphy
A derived or specialized character
Apomorphy
Character shared by two or more groups originating in their last common ancestor
Synapomorphy
Character shared by a number of groups but inheriting from ancestors older than the last common ancestor
Symplesiomorphy
Taxonomy
Classifying living things
How many species of beetles have been named?
300,000
What categories did the Aristotelian system categorize organisms?
Into plants and animals
Science of classifying organisms
Taxonomy
What are the three domains?
Archaea
Bacteria
Eukarya
How do complex characters develop?
Series of small steps
Environmental pressures
