This method involves clustering or grouping of individuals of a taxon or several taxa. Based on overall similarity, identifications are being made. The desired size of the clusters or groupings is called the operational taxonomic unit (OTU).
The identification method involves measurement of taxon to taxon simi-larity or dissimilarity. It is measured using a scale of 0 to 1. '1'represents perfect identity. '-1'designates dissimilarity between taxa. In this method enormous amount of data are collected for related groups. Analyses are made, using statistical tools and computers.
The characterization and identification of a cell's complete chromosome set is referred to as karyotyping. It is the first stage in the process of using chromosomes in taxonomy.
Karyotypes within interbreeding populations of a species are usually constant. Between species there may be variation in chromosome number and size. Final stages of chromosomal aberrations such as inversions and translocations can give clues regarding intermediary stages.
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