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Chapter 1 Evolutionary Trends and Plant Groupings Evolutionary trends, Monophyletic and Polyphyletic origin, Premanera, Evolutionary groupings of living organisms, Five kingdom system of Classification, Origin and Evolution of different plant groups, Evolutionary relationships.
EVOLUTIONARY TRENDS There has been always a dispute among biologuts in tracing the possible origin of cells. Did early cells arise from a single first cell or did numerous first cells originale inde pendently, te. whether they evolved monophyletically, from a single common ancestral stock or polyphyletically, from several separate ancestral stocks Monophyletic versus Polyphyletic origin The proponents of monophyletism beiseve that cells are so complet that multiple origins of such complexities are statistically quite unlikely. They propose that all life started in a single place at a single time from a single cell which formed by lucky accident. They seek the support of homology argument that all cells are fundamentally so remarkably alike in chemical composition, in microscopic structure and in Function that a common origin from a single ancestry in clearly evident. The proponents of polyphyletism propose a probability argument in their own way They state that original cells coul...
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