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Chapter 23

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University of Toronto Scarborough
Biological Sciences
Kamini Persaud

The morphological species concept is classifying organisms based on their appearance. Speciation is the process by which one species splits into two or more daughter species, which thereafter evolve as distinct lineages. Reproductive isolation is when individuals in a population can mate with each other but not with those of another population. Biological species concept states that species are groups of actually or potentially interbreeding natural populations which are reproductively isolated from other groups. Not all evolutionary change results in new species; however, if a species becomes isolated into two different populations. These two populations over a certain amount of time will encounter a change in allele and genotype frequencies as a result of evolutionary mechanisms and then the 2 populations may no longer be able to exchange genes. Speciation requires gene flow within a population that has formally exchanged genes to be interrupted. Allopatric speciation is when a population is divided by a physical barrier. It can
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