Explain why scientists believe the Abert’s and Kaibab squirrels are examples of speciation.
Scientists believe the Abert’s and Kaibab squirrels are examples of speciation because they were geographically isolated by the formation of the Grand Canyon. The Abert’s squirrel lives on the South Rim, while the Kaibab squirrel is isolated on the North Rim. Erosion separated the forests, preventing the two populations from interbreeding, which allowed them to develop distinct physical characteristics over time.
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Which of the following support the importance of geographic isolation as stated in the article? Check all of the boxes that apply.
How can speciation of plants benefit humans?
Speciation increases biodiversity, which provides humans with a wider variety of resources. New plant species can offer new sources of food, medicine, and raw materials. For instance, a new species might develop unique chemical compounds that can be used to create new medications or have traits like drought resistance that can be used to improve agricultural crops.
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Identify the mechanism for isolation described using the drop-down menus. Geographic isolationAnatomical isolationBehavioral isolation✔ Temporal isolation The red-legged frog breeds in ephemeral ponds from January through March. Its relative, the bullfrog, breeds in permanent ponds from late March through May.
✔ Geographic isolationAnatomical isolationBehavioral isolationTemporal isolation In Death Valley, California, there are several ponds that are formed in various areas of the desert. Each pond contains its own species of fish unique to the pond it lives in.
Geographic isolationAnatomical isolation✔ Behavioral isolationTemporal isolation A male firefly attempts to impress a female firefly for mating. The female does not recognize the pattern of light used by the male firefly and mating does not occur.
Explain the process of evolution through isolation that results in speciation.
Speciation begins when a founding population becomes divided by biogeographic isolation, such as a physical barrier. Over time, each group undergoes independent genetic changes and mutations driven by natural selection in their specific environments. Eventually, these differences lead to reproductive isolation, where the two groups can no longer interbreed, resulting in the formation of new species.
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