4. Do you think it is possible for humans to undergo sympatric speciation? Expla

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4. Do you think it is possible for humans to undergo sympatric speciation? Explain. 5. Earth's different environments are constantly changing due to geologic and climatic processes. With this in mind, could an organism's vestigial structure(s) become useful again and eventually be required for survival? Explain. Evolution Connection Typically speaking, in the human population, humans lack the ability to metabolize lactose. This condition is known as lactose intolerance. It is necessary for infants to digest lactose because that is their primary source of nutrition. As a person ages, they often lose this ability to digest milk sugar. Humans of Asian and African descent are two examples. Provide a hypothesis why humans at/from higher latitudes retain the ability to digest lactose.

Explanation / Answer

1.

While its possible humans could speciate into two distinct groups at some point in the future, it hasn't happened recently (100 kya) and it doesn't seem to be happening now. If it were happening we would see two or more distinct populations that didn't interbreed and over time accumulated increasing differences.

These skin colors track most of the evolution we've done in the last hundred thousand years or so, and none of the people from different parts of the globe have any difficulty reproducing with any of the others. If speciation is happening it hasn't happened yet. I doubt speciation could happen given how much gene transfer there was between populations just on foot and boat, never mind planes and trains. Although, speciation does not require physical isolation to occur. See Wallace Effect and sympatric speciation. If there's enough pressure agaist hybridization, human speciation could occur. Think blue collar versus white collar worker and the disappearing middle class.

Speciation has certainly happened with humans before. Not with 'evolutionarily modern' humans, but 'evolutionarily modern' is mostly defined as 'humans since the last speciation event', so that's tautological. But Homo erectus, the neanderthals, the denisovans, et cetera(seriously, there's a lot of Homo species) were all descendants from one common ancestor.

2.Here are five of the most notable vestigial organs in humans 1.appendix-in recent studiesfound that the human appendix might be useful, serving as an important storehouse for beneficial bacteria, 2.The tail-bone (sacrum and coccyx) were meant to provide attachment to muscles of the tail in animals, but they only serve to provide attachment to few pubic muscles in humans.

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