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.

What Is Homology in Biology and Why Does It Matter?
The tricky part is distinguishing true homologies from analogies. If biologists mistakenly treated bat wings and bird wings as evidence of close kinship, they’d build an incorrect family tree. Sorting homology from analogy requires looking at fine structural details, developmental pathways, genetic sequences, and the fossil record.

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.

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.

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.

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.

What is homology in biology? - California Learning Resource Network
Homology, at its core, posits that similarities between biological entities, whether morphological structures, DNA sequences, or metabolic pathways, are attributable to inheritance from a common ancestor. Crucially, homology isn’t simply about resemblance; it’s about shared evolutionary origin.

3.26: Homologies provide evidence for a common ancestor
Detailed analyses of many different types of organisms reveals the presence of a common molecular signature that strongly suggests that all living organisms share a large numbers of homologies, which implies that they are closely related - that they share a common ancestor.