although goats and sheep appear similar and can be mated (gametes fuse), their offspring are rarely born alive. this is an example of .

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masonmonroe2043 masonmonroe2043

30-11-2022
Biology

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although goats and sheep appear similar and can be mated (gametes fuse), their offspring are rarely born alive. this is an example of .

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charithran8975 charithran8975 · Answer 1 · 2022-12-03T05:48:28+01:00

When Arizona's Grand Canyon formed, squirrels and other small mammals that were once part of a single population were no longer able to contact or reproduce with each other across this new geographic barrier.

They could no longer cross. The squirrel population underwent allopatric speciation. Kaibab and Abert's Squirrels: Separate species of squirrels evolved after the Grand Canyon formed, resulting in different species of squirrels evolving on both sides of the canyon. Reproductive isolation is a set of mechanisms, behaviors, and physiological processes that prevent members of two different species that interbreed or mate from producing offspring, or that ensure that any offspring that may be produced are not fertile. In speciation, an ancestral species splits into two or more offspring species that are genetically different from each other and can no longer interbreed. Darwinian evolutionists distinguished between two main forms of speciation, allopatric speciation, which takes place under conditions of spatial isolation of populations, and sympatric speciation, which occurs within populations sharing the same habitat.

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