By Cleveland P. Hickman Jr., Larry S. Roberts, Allan Larson
The 3rd variation of Animal variety offers a survey of the animal state with emphasis on variety, evolutionary relationships, useful variations, and environmental interactions. it's adapted for a one-semester or one-quarter path and is suitable for either non-science and technology majors.
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Extra resources for Animal Diversity
Science of Zoology and Evolution of Animal Diversity © The McGraw−Hill Companies, 2002 Text chapter one use the term neo-Darwinism to denote Darwinian evolutionary theory as revised by Weismann. The genetic basis of neo-Darwinism eventually became what is now called the chromosomal theory of inheritance, a synthesis of Mendelian genetics and cytological studies of segregation of chromosomes into gametes. Gregor Mendel published his theories of inheritance in 1868, 14 years before Darwin died. Darwin presumably never read this work, although it was found in Darwin’s extensive library after his death.
It is highly unlikely that the different alleles present in a small ancestral population are all passed to descendants without any change of allelic frequency. This chance ﬂuctuation in allelic frequency from one generation to the next, including loss of alleles from a population, is called genetic drift. Genetic drift occurs to some degree in all populations of ﬁnite size. Perfect constancy of allelic frequencies, as predicted by Hardy-Weinberg equilibrium, occurs only in inﬁnitely large Hickman−Roberts−Larson: Animal Diversity, Third Edition 1.
Thus, we must distinguish an animal’s fundamental niche, which describes its potential role, and its realized niche, the subset of potentially suitable environments that an animal actually experiences. Populations Animals exist in nature as members of populations. As we saw in Chapter 1, a population is a reproductively interactive group of animals of a single species (p. 19). A species of animal may contain a single, cohesive population or many geographically disjunct populations, often called demes.
Animal Diversity by Cleveland P. Hickman Jr., Larry S. Roberts, Allan Larson