Most humans are not able to digest the lactose in milk as adults. But. in some h
ID: 67074 • Letter: M
Question
Most humans are not able to digest the lactose in milk as adults. But. in some human populations, individuals who have at least one copy of a dominant mutation continue to produce an enzyme that breaks down lactose into adulthood. The genotype of lactose tolerant individuals is LL or LI; the genotype of lactose intolerant individuals is II. You take data from a large population of humans that are isolated from other populations. You find genotype frequencies of What are the allele frequencies within this population? Two generations later, another group of scientists measures genotype frequencies in this population again. This lime they find genotype frequencies of P = 0.10. H = 0.50. and Q = 0.40 What are the allele frequencies within this population now? Has this population undergone evolution? How do you know? Propose a reasonable hypothesis to explain your results. Remember that this is a large and isolated population. If this were a very small population (and not a large one), how might it change your answer?Explanation / Answer
allele frequency of p = 0.01 + 1/2 x 0.18 = 0.1
allele frequency of q = 0.81 + 1/2 x 0.18 = 0.9
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After 2 years:
allele frequency of p = 0.10 + 1/2 x 0.50 = 0.35
allele frequency of q = 0.40 + 1/2 x 0.50 = 0.65
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Yes the population has evolved because there is a marked change in the allele frequencies.
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Since the frequency of LL and Ll have increased, it may indicate that natural selection for the individuals who are tolerant to lactose.
If it was a small population, it might indicate that mating has occurred between dominant individuals.
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