Discuss phylogenetic classification system, numerical taxonomy, cytotaxonomy and chemotaxonomy.
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Phylogenetic Classification
Basis: Evolutionary relationships and common ancestry
Assumption: Taxa share common ancestors; classification reflects phylogeny
Numerical Taxonomy (Phenetics)
Method: Computer-based analysis of numerous characters
Features:
- Characters assigned numerical codes
- Equal weightage to all characters
- Processes hundreds of characters simultaneously
- Objective, quantitative approach
Cytotaxonomy
Basis: Cytological features:
- Chromosome number
- Karyotype structure
- Chromosomal behavior during division
Chemotaxonomy
Basis: Chemical constituents (secondary metabolites, proteins, DNA sequences)
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