clade

Thân thiện

A phylogenetic tree diagram shows a major clade of flowering plants.

Definition

1. Noun:
   • A group of biological taxa or species that share features inherited from a common ancestor: In evolutionary biology, a clade is a complete branch of the tree of life, consisting of a single common ancestor and all of its descendants. It represents a single "snapshot" of evolutionary history.

Usage Examples

• Noun:
  • Birds and crocodiles form a clade within the larger group of reptiles.
  • The discovery of the fossil helped scientists define a new clade of early mammals.
  • In the phylogenetic tree, each colored section represents a distinct clade.

Advanced Usage

• Monophyletic Group: "Clade" is synonymous with the term "monophyletic group." This emphasizes that the group includes descendants of a common ancestor.
  • A valid clade must be monophyletic; it cannot exclude any descendant species.
• Cladistics: This is the field of biology dedicated to classifying organisms based on their evolutionary relationships into clades.
  • Cladistics uses shared derived characteristics to reconstruct clades.

Variants and Related Words

• Cladistic (adj): Relating to the classification of organisms into clades based on shared characteristics from a common ancestor.
  • The cladistic analysis revealed unexpected relationships.
• Cladogram (n): A branching diagram that shows the evolutionary relationships among different biological species or taxa based on similarities and differences, effectively mapping out clades.
  • The cladogram clearly illustrated which species belonged to the same clade.

Synonyms

• Monophyletic group: A group consisting of an ancestor and all its descendants.
• Lineage: A sequence of species each of which is considered to have evolved from its predecessor (can be similar but less precise than "clade").

Related Terms and Concepts

• Phylogeny: The evolutionary history and relationships of a species or group of species, often represented by a tree diagram containing clades.
• Taxon (plural: taxa): A named group of organisms at any level in a classification system (e.g., family, genus). A clade is a specific type of taxon defined by evolutionary history.

Học thuật

Noun

1. a group of biological taxa or species that share features inherited from a common ancestor