Lab 3 Hardy-Weinberg Equilibrium/Evolution Extra Credit Questions BIOL 106 Lab 1. Under what circumstances might a potentially lethal allele be eliminated in a population? 2. What are the relationships among the terms allele, phenotype, and genotype and why are these terms important in determining how evolution occurs? 3. Would you expect there to be any real life populations of organisms that exhibit Hardy-Weinberg Equilibrium? Explain. Support your answer with an example. 4. In a population of 100 cats of which black is the dominant phenotype over white, there are 84 black cats. What is the frequency of white cat? What percentage of the population are heterozygous? Show work. 5. If 98 out of 200 individual in a population express the recessive phenotype, what percent of the population are heterozygotes? 6. Brown hair (B) is dominant to blond hair (b). If there are 168 brown haired individuals in a population of 200: a) what is the predicted frequency of heterozygotes? b) what is the predicted frequency of homozygous dominant? c) what is the predicted frequency of homozygous recessive? 7. In a certain population in Africa, 4% of the population is born with sickle cell anemia. Calculate the % of individuals that have the selective advantage of the sickle cell gene? Explain.
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Potentially lethal alleles might be eliminated in a population if they are expressed in a homozygous recessive state and cause the death of the organism before it can reproduce. This would prevent the allele from being passed on to future generations. Show more…
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Hardy-Weinberg equations You are studying a population of cavefish. Their genotypes and phenotypes follow. AA: normal coloration Aa: normal coloration aa: albino You sample the population and find that 12% of the exhibits albinism. Find the following: the frequency of the dominant allele (p), the frequency of the recessive allele (q), and the proportion of heterozygous individuals. --- Five years later, you return with more funding. You can now assess the genotype of every individual you catch. You sample 100 individuals. Their genotypes are as follows AA: 21 Aa: 42 aa: 37 Find the frequency of dominant alleles (p) and the frequency of recessive alleles (q) -- Compare the p and q values from questions one and two. Is the population in Hardy-Weinberg equilibrium? If the population is evolving what is the likely mechanism, genetic drift, mutation, selective mating, immigration, or natural selection? Please defend your answer.
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In a population that is in Hardy-Weinberg equilibrium, the frequency of the dominant allele is 90%. What is the frequency of the recessive allele? What is the frequency of the homozygous dominant genotype? What is the frequency of the homozygous recessive genotype? What is the frequency of the heterozygous genotype? You are studying Tay-Sachs disease, which is a recessive trait in humans. In a population of 200 people, 75 are homozygous dominant, 100 are heterozygous and 25 are homozygous recessive. What is the frequency of the dominant allele? What is the frequency of the recessive allele? What is the frequency of the heterozygous genotype? Individuals with Tay-sachs disease do not reach reproductive age. After eliminating the people with the recessive phenotype, what will the frequency of the recessive allele be in the remaining population? In a population, there are 156 homozygous dominant individuals, 62 heterozygous individuals, and 37 homozygous recessive individuals. What is the frequency of the dominant allele? What is the frequency of the recessive allele? What is the frequency of the homozygous recessive genotype? What is the frequency of the heterozygous genotype? Is it likely that selection would eliminate a recessive allele from a population, yes or no? Explain your answer. Would genetic drift events like population bottlenecks increase or decrease genetic diversity in a population?
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