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Speciation Barriers
| Answer | Question |
|---|---|
| Species that live in the same region are prevented from mating because they live in different habitats. | Ecological Isolation |
| Species breed at different times of day, during different seasons, or even during different years. | Temporal Isolation |
| Unique mating behaviors or rituals prevent mating among different species. | Behavioral Isolation |
| Physical differences in different species’ sex organs prevent successful mating. | Mechanical Isolation |
| The sperm of one species can’t fertilize the eggs of another species. | Gametic Isolation |
| Genes from different parent species impair the development and survival of hybrids. | Reduced Hybrid Viability |
| Chromosome numbers of the two parent species are different, therefore meiosis in the hybrid does not produce normal chromosome numbers in the gametes. | Reduced Hybrid Fertility |
| Fertile hybrids are produced in the 1st generation, but 2nd generation offspring are weak and sterile. | Hybrid Breakdown |
| A barrier that prevents two species from mating before a zygote is formed. | Pre-zygotic barrier |
| A barrier that prevents a hybrid from surviving or reproducing (occurs after a zygote has formed between two species). | Post-zygotic barrier |
| The offspring of two different species. | Hybrid |
| The formation of new species. | Speciation |
| A group of similar organisms that can mate and produce fertile offspring. | Species |
| Species are found in different areas separated by a physical barrier. | Geographic Isolation |
Created by:
ballb
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