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Positive chemotaxis is movement toward the source of the chemical stimulus (along the chemical concentration gradient in air or water); negative chemotaxis is movement away from the source. The phenomenon is known to exist in a number of microorganisms and invertebrates.
In multicellular organisms, chemotaxis is critical to early development (e.g., movement of sperm towards the egg during fertilization) and subsequent phases of development (e.g., migration of neurons or lymphocytes) as well as in normal function.lthough chemotaxis is the most frequently studied form of migration there are several other forms of locomotion in the cellular level. 1  Chemokinesis is also induced by molecules of the liquid phase of the surrounding environment; however, the response elicited is a not vectorial, random taxis.