By Paula Hawthorne, Jenny Wang-Holmes, Judy Cawdell-Smith, Ann E.O. Trezise
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Extra info for DNA Profiling of Horse Urine Samples to Confirm Donor Identity
2 shows their distribution in the various phyla of the animal kingdom . 1 8 Note that for more than a third of the phyla , no data on the mode of germ-cell development are available . Early and rigid determination of the germ line (Fig. 6a) is found in 14 phyla in the animal kingdom and one phylum of protists. It is characterized by an irreversible segregation of the soma and germ line early in embryo genesis. Often this is under maternal control, the germ-line cells being determined by material deposited by the mother in the egg cytoplasm .
Clonal selection occurs; third, an endogenous viral vector picks up copies of the abundant new 'mutant' mRNA produced by the successful cells, and transports it to the germ line ; finally, the new genetic information carried by the retrovirus is integrated into the DNA of the germ-line cells by a process involving reverse transcriptase . This hypothesis is illustrated diagrammatically in Fig. 7. Steele's hypothesis is, of course, a curious and interesting version of pangenesis . If true, it is important , because the mechanism suggested could be significant in the evolution of all organisms, regardless of their mode of germ-cell formation .
It is characterized by an irreversible segregation of the soma and germ line early in embryo genesis. Often this is under maternal control, the germ-line cells being determined by material deposited by the mother in the egg cytoplasm . During embryogenesis, germ-line cells tend to have a low rate of division. In organisms that have late germ-line determination (Fig. 6b), the germ line is distinct, but differentiates at an advanced developmental stage , after the formation of several other major tissues.