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.

Homologies - Understanding Evolution
Homologies can be identified by comparing the anatomies of different living things, looking at cellular similarities, studying embryological development, and studying vestigial structures within individual organisms.

Homology | Morphology, Comparative Anatomy & Genetics | Britannica
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.

HOMOLOGY Definition & Meaning - Merriam-Webster
The similarity of a structure or function of parts of different origins based on their descent from a common evolutionary ancestor is homology. Analogy, by contrast, is a functional similarity of structure that is based on mere similarity of use.

What Is Homology in Biology and Why Does It Matter?
Homology is the term biologists use when two structures, genes, or traits in different species exist because they were inherited from the same common ancestor.

Homology: Orthologs and Paralogs
Homology refers to biological features including genes and their products that are descended from a feature present in a common ancestor. Homologous features such as genes are referred to as homologs (or homologues if you follow British spelling).

7.13C: Homologs, Orthologs, and Paralogs - Biology LibreTexts
In genetics, the term “homolog” is used both to refer to a homologous protein and to the gene ( DNA sequence) encoding it. As with anatomical structures, homology between protein or DNA sequences is defined in terms of shared ancestry.

Homologs Explained: Genes, Structures, and Analogs
Recognizing homologous features allows scientists to trace lineage and reconstruct evolutionary descent. The presence of homologous elements across diverse species provides evidence for the deep connections that link living organisms through geological time.

Homology - Definition and Examples - Biology Online Dictionary
In biology, homology refers to the similarity of the structure, physiology, or development of various species of other organisms as a result of their shared evolutionary parent. It plays a huge part in evolutionary biology.

What is Homology? - National Center for Science Education
Scientists test a claim of homology by making a prediction based on that claim, and then seeing whether the evidence supports that claim or refutes it. If repeated tests continue to confirm a claim of homology, scientists can be increasingly confident that they are right.