Biology, 31.07.2019 14:00 powellkhalil58

The grand canyon was carved out by the colorado river. this caused the separation of members of a squirrel species. abert’s squirrel lives on the southern side of the canyon and in other parts of the united states. a subspecies, the kaibab squirrel, is found around the northern rim of the canyon and nowhere else in the country. as shown here, the two squirrels differ in body and tail coloration. their ears are also different. these variations are the result of what?

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Answer from: lwammes

I believe it is geographic isolation. Hope it helps.

Answer from: heber9609

The correct answer would be geographic isolation.

Geographic isolation is a type of isolation in which organisms of the same species are prevented from exchanging genetic due to the separation of the organisms through physical structures such as a river, mountain et cetera.

For example, the squirrels were separated through the Colorado River.

Over generations, organisms evolve new traits as an adaptation towards different habitats.

For example, the squirrels evolved different ears, tails, and body type.

Over several generations, accumulation of genetic variations makes the two populations so different that they can not interbreed with each other.

Thus, the populations evolved into different species.

Answer from: Quest

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

Answer from: Quest

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

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