Speciation Explained in 60 Seconds #Shorts

Speciation occurs when populations of one species become reproductively isolated and diverge genetically over time. Geographic barriers (allopatric speciation) or ecological niches within the same area (sympatric speciation) can drive this process, ultimately creating distinct species that can no longer interbreed.

Subject: Evolutionary Biology

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1. Different calls
2. Different timing
3. Different habitat
4. Postzygotic
5. Infertile hybrids
6. Inviable offspring
7. Speciation is how one species becomes two. It's the process that has generated the millions of species alive today — and billions more that went extinct.
8. It starts with a single interbreeding population. As long as individuals can mate and share genes freely, the population stays as one species.
9. In allopatric speciation, a geographic barrier splits the population — a mountain range, river, or ocean. Gene flow between groups stops completely.
10. Separated populations face different environments. Natural selection, genetic drift, and mutation cause them to diverge independently over many generations.
11. Given enough time, the two populations become so genetically different that they can no longer interbreed — even if the barrier disappears.
12. Sympatric speciation happens without geographic separation. Organisms in the same area diverge by exploiting different niches, food sources, or mating times.
13. Reproductive isolation is the key test. If two groups can't produce viable, fertile offspring together, they are considered separate species.
14. This isolation can be prezygotic — preventing mating through different calls, timing, or habitats — or postzygotic — where hybrids are infertile or inviable.
15. Speciation — populations diverging until they become distinct species. The branching tree of life, growing one new twig at a time.

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