لینک پرداخت و دانلود در "پایین مطلب"
فرمت فایل: word (قابل ویرایش و آماده پرینت)
تعداد صفحات:5
Insight into Cellular "Consciousness"
The primacy of DNA in influencing and regulating biological behavior and evolution is based upon an unfounded assumption. A seminal article by H. F. Nijhout (BioEssays 1990, 12 (9):441-446) describes how concepts concerning genetic "controls" and "programs" were originally conceived as metaphors to help define and direct avenues of research. Widespread repetition of this compelling hypothesis over fifty years has resulted in the "metaphor of the model" becoming the "truth of the mechanism," in spite of the absence of substantiative supporting evidence. Since the assumption emphasizes the genetic program as the "top rung" on the biological control ladder, genes have acquired the status of causal agents in eliciting biological expression and behavior (e.g., genes causing cancer, alcoholism, even criminality).
The notion that the nucleus and its genes are the "brain" of the cell is an untenable and illogical hypothesis. If the brain is removed from an animal, disruption of physiologic integration would immediately lead to the organism's death. If the nucleus truly represented the brain of the cell, then removal of the nucleus would result in the cessation of cell functions and immediate cell death. However, experimentally enucleated cells may survive for two or more months with out genes, and yet are capable of effecting complex responses to environmental and cytoplasmic stimuli (Lipton, et al., Differentiation 1991, 46:117-133). Logic reveals that the nucleus can not be the brain of the cell!
مقاله Insight into Cellular Consciousness