![]() But when the populations become geographically discontinuous, that free flow is prevented. So the frequency of an alil at one end of distribution will be similar to the frequency of the illegal at the other end. So the movement of a leal's across the range of the species is pretty free because individuals can move and then mate with individuals in their new location. So a geographically continuous population has a gene pool that is homogeneous. This happens when there is uh interruption in gene flow. And so if we look at ala Patrick, speciation. So for speciation to occur, two new populations must be formed from one original population, and they must evolve in such a way that it becomes impossible for individuals from the two new populations to interbreed. And we can see that in a file a genetic tree. And so there must be mechanisms for speciation, which is the formation of two species from one original species. So there there's extraordinary diversity of life on our planet. Uh But for the majority of species that this the rule generally holds. Uh There's a lot of species that are similar enough to produce hybrid offspring, and some make occur in nature. ![]() And you know, there can be exceptions to this rule. So definition of species, sexually reproducing organisms, uh is a group actually, or potentially interbreeding individuals. So they will share characteristics and behaviors that can lead to successful reproduction. ![]() In common with your parents than you do with say your cousin or your grandparent, and organisms of the same species have the highest level of DNA alignment. If you think of your family, you have more D. The closer relationship to organisms share the more DNA they have in common. Members of the same species share external and internal characteristics that developed from their DNA. So one species is distinguished from another when in nature it's not possible for matings between individuals from each species to produce fertile offspring. So a species is a group of individual organisms that interbreed and produce fertile viable offspring.
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