Saturday, July 2, 2011

Lamarckian inheritance



Mendel's 1st Law.......The two members of a gene pair segregate from each other during meiosis; each gamete has an equal probability of obtaining either member of the gene pair......evolved into modern laws of genetics, wherein it is universally accepted that the genes from progenitors determine the fixed genetics of their offspring.  However, it is now accepted that mutation of these genes occurs as the organism adapts to circumstances that may have not been present earlier in the history of the genome of a species.....Lamarck implied, without the utilization of modern evolutionary or genetic science, that circumstance may alter the process of "fixing" the organism, thereby allowing for changes predicated by the chemical processes that have occurred during early development and possibly even by modifications made subsequent to the youth of the organism.    My favorite example is the giraffe......giraffes that stretch for the high-growing berries are more likely to locate food that shorter-necked giraffes cannot reach, thereby modifying the gene that determines neck length, insuring that their offspring will be more suited for survival.    In humans, which are capable of conscious alteration of behavior,  both the intellectual, emotional and even "psychic" aspects of being may be genetically modified by the consciously altered constructs which determine personality as well as the sheer physical adaptations that they make to accommodate change.  Thought is as transformative as physical adaptation to our needs.  


                       


    Scenes of Travel by Eleanor Hodgkinson

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