Comparative Ecology of Microorganisms and Macroorganisms by John H. Andrews

By John H. Andrews

The most vital characteristic of the fashionable artificial thought of evolution is its beginning upon an excellent number of organic disciplines. -G. L. STEBBINS, 1968, p. 17 This booklet is written with the objective of featuring ecologically major anal­ ogies among the biology of microorganisms and macroorganisms. I give some thought to such parallels to be very important for 2 purposes. First, they serve to stress that in spite of the fact that assorted lifestyles will be, there are universal subject matters on the ecological point (not to say different levels). moment, examine performed with both microbes or macroorganisms has implications which go beyond a selected box of research. even if either issues might sound noticeable, the actual fact is still that at­ tempts to forge a conceptual synthesiS are astonishingly meager. whereas unify­ ing options would possibly not unavoidably be strictly right, they permit one to attract analogies throughout disciplines. New beginning issues are chanced on as a conse­ quence, and new methods of issues emerge. The macroscopic organisms ('macroorganisms') comprise such a lot represen­ tatives of the plant and animal kingdoms. I interpret the time period 'microorganism' (microbe) actually to intend the small or microscopic kinds of lifestyles, and that i contain during this classification the micro organism, the protists (excluding the macroscopic eco-friendly, brown, and crimson algae), and the fungi. convinced greater organisms, reminiscent of a number of the nematodes, fall logically inside of this realm, yet are usually not mentioned at any length.

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If the exchanges are grossly unequal, an interchange may closely resemble a unilateral transposition (discussed below under site-specific recombination). In any case, reformed chromosomes will be stably transmitted through mitosis if each has a centromere. If the cells involved end up in the germ line and undergo meiosis, the meiotic products usually have deficiencies, depending on the type of interchange. Intrachromosomal structural changes can be illustrated by imagining the three repair options for two breaks occurring within the same chromosome (Chapter 6 in Fincham 1983).

3 Sex and Meiotic Recombination 41 clusive and part of the impasse appears to be that a universal explanation which can be held forth as a paradigm is being sought. , the males of many species of Diptera). Assuming these observations are correct, then the possible explanations are that damage in the germ lines of such organisms may not occur (which seems inconceivable), that it is unusually rare (unlikely), that it is not repaired (affected cells consequently die), or that it is fixed by some other, unidentified mechanism (quite possible).

Campbell 1981; Levin 1988). 5).

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