Isogenetic

Precipitins exhibit the remarkable fact that a definite protein forms precipitins in the rabbit, not only against itself (specific or isogenetic) and against the protein of related animal species (homeogenetic), but also against that of distant species (heterogenetic).

A recent advance in the study of this experimental system has been the use of a Xenopus hybrid which gives rise to large clones of fully identical, isogenetic animals (Kobel and DuPasquier, 1975).

If the first of these objectives which involves cultivation in vitro is achieved, it can be used to obtain haploid plants and, by means of subsequent duplication of chromosomes, diploid plants which are genetically pure (isogenetic strains); by reproducing the isogenetic lines by controlled self-fertilization, it is possible to obtain seed which could be used as the first stock for the individual lines.

The metallogenic picture of the Bohemian Massif is based on the division of mineralizations into isogenetic pre-Varisacan, Variscan (early and late Variscan), Mesozoic and Neogene-Quaternary mineral associations (Bernard 1967, Bernard-Dudek 1967).

This classification is based upon 'isogenetic mineral paragenesis', that is the mineral associations that originated about the same time and approximately under the same physicochemical conditions in the same place.

Thus, isogenetic hydrothermal occurrences of cinnabar and/or stibnite with scheelite seem to be incompatible.