on the subject when Alfred Russel Wallace sent him a version of virtually the same theory in 1858. Cambridge, Massachusetts: Belknap Press. Fossils, along with the comparative anatomy of present-day organisms, constitute the morphological, or anatomical, record. Chicago, Illinois: Encyclopdia Britannica, Inc. Philosophical Transactions of the Royal Society B: Biological Sciences. However, viable hybrids are occasionally formed and these new species can either have properties intermediate between their parent species, or possess a totally new phenotype. Maynard Smith, John (1993).
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Descendants inherit genes plus environmental characteristics generated by the ecological actions of ancestors. Pigliucci, Massimo ; Müller, Gerd., eds. "Laboratory Experiments on Speciation: What Have We Learned in 40 Years?". Instead, speciation results from the evolution of mechanisms that reduce gene flow between the two populations. ; Johnson, George. This is not common in animals as animal hybrids are usually sterile. Burke, John.; Arnold, Michael. 128 The intermittent mass extinctions are also important, but instead of acting as a selective force, they drastically reduce diversity in a nonspecific manner and promote bursts of rapid evolution and speciation in survivors.
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