Biology 1002B Lecture Notes - Retina, Wild Type, Visual Phototransduction

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No theoretical reason or empirical evidence that evolutionary lineages increase in complexity over time. Eukaryotic cells more complex than prokaryotic cells, animals/plants more complex than protists. Increase in complexity in embryonic development in the transformation from a zygote to a multicellular organism: most common method. Increase in organismal size: embryonic development (increasing complexity) accompanied by increasing size, not a criteria because no sustained size increase over lineages, evolution causes a decrease in size. Parasites, organisms in-between sand grains at high tides on beaches, large animals after isolation on islands. Life style: parasitism became successful in invertebrates as large potential hosts evolved, parasites evolved as organism simplified/disappeared, life cycle of a parasite may become complex and have many intermediate hosts, adaptive advantage of a life cycle complexity. Parasite increases population in intermediate hosts increases chances of infecting primary host. Spreading in early stages of intermediate hosts conserves resources of primary host parasite"s productive for longer periods.

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