Binomial Nomenclature

The system of biological classification used today was developed by Carolus Linnaeus in 1758. His […]

Charles Darwin

Darwin was a student at Cambridge University when his botany professor recommended him for a […]


The three main constraints on evolution are: Disequilibrium - Natural selection only produces optimal adaptations […]

Darwinian Evolution

Evolution is defined as the change in allele frequencies of a population. Darwin's Theory of […]


There are three domains, each consisting of several kingdoms. Bacteria and archaea are both prokaryotes, […]

Evolutionary agents

What Is An Evolutionary Agent? An evolutionary agent causes changes in the allele and genotype […]

Evolutionary Chronometer

An evolutionary chronometer (or ED) is a nucleotide or amino acid sequence that is similar […]

Evolutionary distance

Evolutionary trees (aka phylogenetic trees) began when Carolus Linnaeus began classifying more than 10,000 plants […]

Genetic and phenotypic variation

A phenotype is the physical expression of genes. The genotype is the set of alleles […]


Angeles National Forest Angeles National Forest Joshua Tree National Park Joshua Tree National Park Joshua […]


Biological classification systems and unique names are important for several reasons: They are aids to […]

Reconstructing Phylogenies

Select a group of organisms to classify (the ingroup) and an appropriate outgroup. Choose the […]

Taxonomic Units

Most taxonomists today believe that biological classification systems should reflect evolutionary relationships and that taxonomic […]

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