Assignment
Your assignment is to read Erika Check’s article about milk tolerance in adult humans and answer the following questions in the form of an essay. Each of these questions requires you to describe, or make predictions, based upon evolutionary processes. Do NOT use direct quotes from the Check article. Instead summarize points and arguments in your own words. You should be explicit about the relevant evolutionary principles in your answers.
Why can individuals from only some human populations tolerate milk as adults?
In your own words, describe in detail the genetic changes that allow for milk tolerance in adult humans.
What do these genetic changes tell us about the evolutionary history of milk tolerance in human populations?
What would you expect to happen to the percentage of the population who could tolerate milk if the individuals in the population stopped drinking milk due to the increased availability of other foods? Why?
Neandertals are a fossil human species that lived in Europe and western Asia between about 200,000 and 40,000 years ago. They subsisted exclusively on hunted and gathered foods. Based on your knowledge of milk tolerance in humans, would you expect that Neandertals were able to tolerate milk as adults? Explain why or why not?
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