Homology (biology) - Wikipedia
In biology, homology is similarity in anatomical structures or genes between organisms of different taxa due to shared ancestry, regardless of current functional differences.
Homology | Morphology, Comparative Anatomy & Genetics
Nov 15, 2024 · homology, in biology, similarity of the structure, physiology, or development of different species of organisms based upon their descent from a common evolutionary ancestor. Homology is contrasted with analogy, which is a functional similarity of structure based not upon common evolutionary origins but upon mere similarity of use.
7.13C: Homologs, Orthologs, and Paralogs - Biology LibreTexts
Nov 23, 2024 · Homology forms the basis of organization for comparative biology. A homologous trait is often called a homolog (also spelled homologue). In genetics, the term “homolog” is used both to refer to a homologous protein and to the gene ( DNA sequence) encoding it.
Homology - Definition and Examples - Biology Online Dictionary
Jul 14, 2023 · In biology, homology refers to similarities caused by shared ancestry between two structures or genes from distinct species.
Homologies and analogies - Understanding Evolution
We use homologous characters — characters in different organisms that are similar because they were inherited from a common ancestor that also had that character. An example of homologous characters is the four limbs of tetrapods. Birds, bats, mice, and crocodiles all have four limbs. Sharks and bony fish do not.
Sequence homology - Wikipedia
Sequence homology is the biological homology between DNA, RNA, or protein sequences, defined in terms of shared ancestry in the evolutionary history of life.
18.5F: Homologous Structures - Biology LibreTexts
Nov 23, 2024 · Homology is the relationship between structures or DNA derived from the most recent common ancestor. A common example of homologous structures in evolutionary biology are the wings of bats and the arms of primates.
The Search for Common Origin: Homology Revisited - PMC
Homology is a central concept in biology, and it is used at all hierarchical levels of life. Minelli and Fusco (2013) published an extensive review of the long trajectory across centuries of the concept (s) of homology.
Evolution and the Concept of Homology | SpringerLink
Jan 1, 2024 · Homology was originally defined by Richard Owen in 1843 as “the same organ in different animals under every variety of form and function” . Its current most common usage is in the sense of phylogenetic homology, which requires presence of the phenotypic character (or trait) in the common ancestor and continuity of its expression along an ...
Essay: Homology | Embryo Project Encyclopedia
Nov 23, 2011 · Homology is a central concept of comparative and evolutionary biology, referring to the presence of the same bodily parts (e.g., morphological structures) in different species.