Glossary of terms used in Phylogeny Reconstruction.
Heuristic This is an algorithm that uses a short-cut or educated guess in order to reduce the amount of time necessary to execute an algorithm or method.
Higgins, Des The original
author of the CLUSTAL suite of programs for performing automated, progressive
multiple sequence alignment. email: firstname.lastname@example.org
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.
Homology see Homologous.
Choose the first letter of your term.