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7. Why could milk have provided strong favorable selection for lactase persistence?

7. Why could milk have provided strong favorable selection for lactase persistence?

Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter25: The Origin Of Life
Section: Chapter Questions
Problem 7TYK: In a population of self-replicating RNA molecules, natural selection would favor those molecules...
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Can someone help me answer non-graded bio questions pertaining to lactase I'm trying to understand it more?

9. Study the figure below. Each pie chart represents a distinct population. The degree to which the pie chart is filled in illustrates the percentage of individuals in that population who are lactase persistent. Lactase persistence Lactase non-persistence O a. Identify two trends you see in the data. Provide evidence to support each trend. b. State one possible hypothesis that can explain the global distribution of lactase persistence (lactose tolerance) and lactase nonpersistence (lactose intolerance). Be sure to include the following keywords in your explanation: selection, fitness, survival.
Transcribed Image Text:9. Study the figure below. Each pie chart represents a distinct population. The degree to which the pie chart is filled in illustrates the percentage of individuals in that population who are lactase persistent. Lactase persistence Lactase non-persistence O a. Identify two trends you see in the data. Provide evidence to support each trend. b. State one possible hypothesis that can explain the global distribution of lactase persistence (lactose tolerance) and lactase nonpersistence (lactose intolerance). Be sure to include the following keywords in your explanation: selection, fitness, survival.
7. Why could milk have provided strong favorable selection for lactase persistence? 8. In humans, the AMY1 gene produces the enzyme amylase in cells of the salivary glands. Amylase breaks down starch (a polysaccharide) into the sugar maltose (a disaccharide). People from cultures with diets high in starch produce more amylase than people from cultures with diets low in starch because of a mutation in the AMY1 gene. Explain in two to three sentences why the frequency of this AMY1 mutation would have increased in frequency in populations with a high starch diet.
Transcribed Image Text:7. Why could milk have provided strong favorable selection for lactase persistence? 8. In humans, the AMY1 gene produces the enzyme amylase in cells of the salivary glands. Amylase breaks down starch (a polysaccharide) into the sugar maltose (a disaccharide). People from cultures with diets high in starch produce more amylase than people from cultures with diets low in starch because of a mutation in the AMY1 gene. Explain in two to three sentences why the frequency of this AMY1 mutation would have increased in frequency in populations with a high starch diet.
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