遺傳變異及物種形成-資料下載頁
2025-05-15 22:11本頁面
【正文】 s evolves in geographic isolation from the parent species. It may take place most readily in peripheral isolates, small populations at the extreme edge of a species range. The bined effect of a small atypical population and extreme environmnental conditions can cause rapid and extensive geic reanization (a geic revolution) leading to speciation. Allopatric speciation This form of speciation occurs where the speciating populations are contiguous but subject to different environmental (. climatic) conditions in different parts of the range, Intermediate hybrids are found, as in ring species, but the large distances involved prevent the two types from merging pletely. Parapatric speciation 相關(guān)主題 適應(yīng)（ B1） 遺傳變異（ O1） 同域性物種 形成 同域性物種形成可能發(fā)生在沒有地理隔離，但具有宿主選擇差異、食物選擇差異或生境選擇差異的種群。同域性物種形成是否發(fā)生尚有爭議，盡管已觀察到植食性昆蟲宿主選擇的快速變化。植物可以通過多倍體進(jìn)行同域性物種形成。 Related topics Adaptation (B1) Geic variation(O1) Sympatric speciation Sympatric speciation may occur where there is no geographical separation between the speciating populations of habitat preference. Whether sympatric speciation happens at all is a contentious issue, although rapid changes in the host preference of phytophagous insects has been observed. Plants can undergo sympatric speciation through polyploidy
教學(xué)課件相關(guān)推薦
鄂ICP備17016276號(hào)-1