Classification and Taxonomy of Living Things

Binomial Nomenclature

The standardized two-part naming system established to give every organism a distinct scientific name.

Genus

The first word in the binomial nomenclature identifying the generic group; must always be capitalized.

Species

The second word in the binomial nomenclature that identifies the specific epithet; must always be lowercase.

Carl Linnaeus

Swedish biologist known as the 'Father of Taxonomy' who formalized the use of binomial nomenclature.

Taxonomy

The branch of science dedicated to naming, defining, and classifying organisms based on shared characteristics.

Homologous Features

Anatomical structures that share a common evolutionary origin, even if their current functions differ.

Hierarchical Classification System

A structure of classification introduced by Linnaeus, organizing life into categories such as Class, Order, Genus, and Species.

The Three Domains of Life

Archaea, Bacteria, and Eukarya; classifications grouping organisms based on cellular structure.

Molecular Basis of Taxonomy

A modern approach relying on DNA sequencing and genetic comparisons rather than solely on morphological characteristics.

Hybrid

Offspring resulting from the crossbreeding of two distinct species with overlapping ranges and compatible genetics.

Phylogenetic Tree

A branching diagram indicating evolutionary lineages and genetic relationships among organisms.

Cladogram

A specific type of phylogenetic tree that focuses on the sequence of evolutionary branching based on shared derived characteristics.

Prokaryote

A cellular organism lacking a membrane-enclosed nucleus.

Eukaryote

A cellular organism containing a membrane-enclosed nucleus.

Autotroph

An organism capable of synthesizing its own nutrients (e.g., via photosynthesis).

Heterotroph

An organism requiring external organic compounds for sustenance.

Fertile Hybrid

Hybrid offspring that are capable of reproducing and producing viable offspring.

Sterile Hybrid

Hybrid offspring that are incapable of biological reproduction.