One cause of speciation is reproductive isolation or the separation of the population of a species from other populations so that it can change without keep getting mixed with other populations ...
Causes of speciation. Geographic isolation In the fruit fly example, some fruit fly larvae were washed up on an island, and speciation started because populations were prevented from interbreeding by geographic isolation.
There could be multiple causes for speciation. Geographical isolation is probably the most common cause. When some amount of individuals of the same existing species migrate to a completely new geographical location and reproduce, the offspring that maybe born could be totally different from the parents but better suited to survive in that environment.
Speciation is the evolutionary process by which populations evolve to become distinct species.The biologist Orator F. Cook coined the term in 1906 for cladogenesis, the splitting of lineages, as opposed to anagenesis, phyletic evolution within lineages. Charles Darwin was the first to describe the role of natural selection in speciation in his 1859 book The Origin of Species.
4. because speciation is the formation of new and distinct species in the course of evolution. And interbreed cause to breed with another of a different race or species.
Allopatric speciation. Geographic isolation most often occurs with populations that are completely separated by a physical barrier, such as a mountain range, river, or desert.The separated populations adapt to their own unique environments, becoming so genetically different from one another that members of one population cannot breed with members of the other.
Evolution of reproductive barriers.The underlying cause of speciation is the accumulation of genetic changes that create enough differences so that it constitutes a unique species. A type of reproductive isolation,in which the formation of a zygote is prevented .
Reproductive isolation. The environment may impose an external barrier to reproduction, such as a river or mountain range, between two incipient species but that external barrier alone will not make them separate, full-fledged species. Allopatry may start the process off, but the evolution of internal (i.e., genetically-based) barriers to gene flow is necessary for speciation to be complete.
Peripatric speciation occurs when a small subgroup of one population becomes geographically isolated from the main group, similar to sympatric speciation, but with a smaller subgroup. Parapatric speciation occurs when two or more subgroups of a population become geographically isolated while maintaining some degree of gene flow between them.
A) The goal of natural selection is speciation. B) When reunited, two allopatric populations will not interbreed. C) Natural selection chooses the reproductive barriers for populations. D) Prezygotic reproductive barriers usually evolve before postzygotic barriers. E) Speciation is included within the concept of macroevolution.