An Introduction to the Invertebrates by Janet Moore PDF

By Janet Moore

ISBN-10: 0521857368

ISBN-13: 9780521857369

Moore's advent is short, yet informative. dependent within the normal layout for a zoology textbook, she covers the fundamentals speedy and good, after which increases attention-grabbing questions that pertain to no matter what phylum is in query. Having already performed coursework in invertebrates, i discovered this a very good refresher and nonetheless filled with issues i didn't comprehend (or had thoroughly forgotten).

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Extra resources for An Introduction to the Invertebrates

Sample text

This is a large question that has been very controversial, but as more and more animals are studied using an increasing number of different molecules, confidence in molecular taxonomy is growing fast also. An indication of the advantages and disadvantages of using molecules may still be useful. 1 Advantages 1. The equivalence of data, since the nature and position of the unit is precisely defined. 2. The enormous size of the data set. 3. Statistical analysis of cladograms, avoiding the pitfalls of parsimony, is possible and only awaits agreement on the statistical methods to be used.

Non-heritable variation is avoided. 2 Disadvantages 1. e. that an unvarying ‘molecular clock’ is ticking at a regular rate. However, the clock is known to be variable in certain conditions, and the whole idea of functionally neutral changes in genes is controversial. Some branches of the evolutionary tree are known to evolve very fast: should we compensate by a subjective decision to omit such species (or groups of species) from our calculations? This has frequently been necessary to obtain results from ribosomal genes.

A clue to the possible evolutionary origins of nematocysts comes from the spores of intracellular parasitic protista. Microsporidia have spores containing coiled eversible threads and Myxosporidia have spores containing nematocyst-like capsules with hollow eversible tubules. When in contact with a suitable host, the spore everts its tubule and through it discharges the entire spore contents into the host cell. Perhaps an early cnidarian ancestor was able to incorporate and use some such parasite; but that is pure speculation.

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An Introduction to the Invertebrates by Janet Moore

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