Diversity and Classification (Taxonomy (As you move down groups the number…
Diversity and Classification
The most recent ancestor between two species is a branch that they both follow off of.
The first species on the tree is the most ancient ancestor. Every other species on the tree have this ancestor in common.
A species' most common ancestor is from the branch that it came off of.
All organisms have evolved from common ancestors, which can be shown on a phylogenetic tree.
Phylogeny is the study of the evolutionary groups of organisms.
As you move down groups the number of species in each group decreases.
The eight levels are, in order: Domain, Kingdom, Phylum, Class, Order, Genus and Species.
Organisms can only be long to one group in the hierarchy meaning that there's no overlap.
Each group in a level is called a taxon.
There are eight levels of groups used to classify organisms. These groups are called taxa.
Taxonomy is the science of classification.
The Binomial System
The name of humans is:
The first part of the name is the genus name, and the second part is the species name. The genus name begins with a capital letter, whereas, the species name doesn't begin with a capital letter. The whole name is underlined, if written or in italics, if typed.
This is the naming system used to name species. It is internationally used so that there are no complications for different species around the world.
Courtship behaviours are species specific meaning that they can be used to classify species.
Example of a complex courtship behaviour: Dancing, e.g. blue-footed boobies perform a complex dance which involves lifting up their feet to show off their blue colour.
Example of a simple courtship behaviour: releasing a chemical, e.g. male bumblebees produce chemicals to attract female bumblebees to their territory.
Courtship behaviour is carried out by organisms to attract a mate of the same species.