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H

Hardy-Weinberg Equilibrium

The principle that states that when Ne = N, in the absence of selection or mutation, gene frequencies will achieve equilibrium after one generation; also called Principle of Law.

heredity

The biological similarity of offspring and parents. (adj. heritable)

heterodont

Having more than one kind of hinge teeth.

hinge

Collective term for the dorsal border of the articulated valves, including the ligament, hinge teeth, and other structures that function to permanently unite the two valves.

histology

The study of cells and tissues at the microscopic level.

holoplanktonic

Living as plankton through all stages of a life cycle.

homologous

Having the same structure and origin, although current function might differ.

hypothesis

An “educated guess,” based on evidence, concerning how or why a phenomenon occurs; see also theory, law.