|the seas and atmosphere on earth before the existence of life, primarily containing a mixture of water, hydrogen, methane, ammonia, and carbon dioxide|
|variation in traits such as body weight or height in which a series of types are distributed on a continuum, not grouped into discrete categories|
|1.||biology an additional type specimen selected because of differences from the original type specimen, such as opposite sex or morphological details|
|2.||immunol any of the variant forms of a particular immunoglobulin found among members of the same species|
allotype al·lo·type (āl'ə-tīp')
Any of the genetically determined antigenic differences within a given class of immunoglobulin that occur among members of the same species.