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Lab 43

Lab 43

Q Question 1 1 / 1 pts (Q001) Review Figures 8.6 ("Relative distributions of the ABO Blood Antigen Alleles Vary Geographically") on p. 235 of your lab manual. Use this information, as well as your understanding of the forces of evolution, to answer the following questions. Many populations throughout central Eurasia share high frequencies of the B allele. What does this pattern suggest about the evolutionary history of these populations? Question 2 1 / 1 pts (Q002) The O allele is unusually frequent in the Americas. What does this pattern suggest about the evolutionary history of these populations? Describe the evolutionary force that probably caused this trait distribution (i.e. could this caused by gene flow, genetic drift, founder effect, genetic bottleneck, natural selection).

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1.Your Answer: The oldest blood group is type A but then it mutated to form type B. Type B originated in Asia with only a quarter of the population having the B type. There was intermixing of populations from Asia with led to the distribution of the B allele. The pattern suggests that as you move towards Europe the B allele disappears. This evolutionary force is called gene flow. Gene flow is defined as the changing of composition of a gene pool due to interbreeding between populations