corresponding or similar in position or structure or function or characteristics; especially derived from an organism of the same species; "a homologous tissue graft"
EDGE, of two or more alleles or chromosomes being of the same locus, though originating from different individuals
Showing a degree of correspondence or similarity such that it suggests a common origin
Being of the same typical structure; having like relations to a fundamental type to structure; as, those bones in the hand of man and the fore foot of a horse are homologous that correspond in their structural relations, that is, in their relations to the type structure of the fore limb in vertebrates
That which is or are derived from the same ancestral structure, base or origination
Descended from a common ancestor Defined in 1843 by Richard Owen, the British Palaeontologist as the "same organ under every variety of form and function" For molecular sequence data, it is taken to mean that two sequences or even two characters within sequences are descended from a common ancestor This term is frequently mis-used as a synonym for 'similar', as in "two sequences were 70% homologous" This is totally incorrect! Sequences show a certain amount of similarity From this similarity value, we can probably infer that the sequences are homologous or not A statement that is attributed to Walter Fitch is that (I'm prarphrasing here) homology is like pregnancy You are either pregnant or not, two sequences are either homologous or they are not
Having the same relative proportion or value, as the two antecedents or the two consequents of a proportion
In phylogenetics, describing particular features in different individuals that are genetically descended from the same feature in a common ancestor In molecular biology, homologous sequences often mean significantly similar sequences that are highly likely to have a common descent
any series of aliphatic organic compounds whose members differ only in the addition of a CH2 group; for example, the carboxylic acids, CH3(CH2)nCOOH where n is any non-negative number