BIOL 103 Chapter Notes - Chapter 24: Species Problem, Isthmus Of Panama, Gray Tree Frog
4 May 2016
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Document Summary
Species: a group of populations whose members have the potential to interbreed and produce viable, fertile offspring. Gene flow tends to hold populations together genetically: reproductive isolation: This is biological factors (barriers) that impede members of 2 species from interbreeding. The barriers block the gene flow between species and hybrids can"t be formed. They act by impeding members of a different species from attempting to mate, preventing an attempted mating from being completed successfully or by hindering fertilization if they do mate. Postzygotic barriers: may contribute to reproductive isolation after the hybrid zygote is formed. There can be developmental errors that reduce survival of the embryos, problems after birth may make them infertile or decrease their chance of survival before they can reproduce: limitations of the biological species concept: The evolution of reproductive isolation can bring about a new species but there are a number of species which this concept can"t be usefully applied, like the fossil record.
