By Kenneth M. Weiss
During this booklet the authors draw on what's recognized, mostly from fresh learn, concerning the nature of genes and cells, the genetics of improvement and animal and plant physique plans, intra- and interorganismal communique, sensation and conception, to suggest few easy generalizations, in addition to the transformed software of the classical evolutionary concept, delivers a broader theoretical knowing of genes, evolution, and the various and complicated nature of residing organisms.
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Extra resources for Genetics and the Logic of Evolution
Example text
In important ways, we attempt to force classical darwinian-mendelian theory in circumstances in which the fit is not so good. This does not mean that inherited traits do not involve genes, but genes are not always good predictors of traits, as will be seen in Chapters 3 through 5. Put another way, the mendelian inheritance of genes does not imply the mendelian inheritance of phenotypes (traits). Phenotypes are not inherited; organisms begin life as single cells with genes but not with arms, stomachs, or flowers.
2003). We also know that horizontal transfer at least occasionally still occurs, for example, by the insertion of viral genes into recipient genomes. If there were complete sequestration, every cell lineage would be an entirely separate species. In fact, a number of normal mechanisms modulate sequestration and connect branches of life. Sexual reproduction within a species keeps the germ lines connected. , sperm or pollen) and recipient (egg or ovum) are so similar. Individual genes within species also are kept connected by recombination between an individual’s incoming paternal and maternal genomes.
This is organismal selection, that is, active selection of the environment by organisms rather than passive selection of organisms by the environment, a reversal of the usual darwinian notion of natural selection. Over time, variation can accumulate, leading organisms to seek ever more specialized environments or to be more reluctant to leave the current one. This self-selection may, but need not, initially involve genetically determined aspects of the organism. Divergence among populations that leads to subsequent speciation can then be aided by genetic changes that are unrelated to environment but provide mating barriers between individuals in the new and old environments.