Cytotaxonomy
It is defined as a classification which is based on cytological studies (number of chromosomes, meiosis behaviour).
It helps us to establish relationship between different organisms based on these features like man has 46 chromosomes and apes have 48.
Chemotaxonomy
It is also known as Biochemical Systematics.
It is defined as a method of classification which is based upon chemical constituents (amino acids, crystals, alkaloids etc). Chemicals are generally static and specific.
Numerical Taxonomy
It is defined as a statistical method based upon number of featured derived from almost every branch of biology.
A number is assigned and computer analysis is done later on. A statistician is required to obtain the results and evaluate them. Graphic displays are quite common.
