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- When male lions reach sexual maturity, they leave their group in search of a new pride. This can alter the allele frequencies of the population through which of the following mechanisms? natural selection genetic drift gene flow random matingPopulation genetics is the study of: how selective forces change the allele frequencies in a population over time the genetic basis of population-wide traits whether traits have a genetic basis the degree of inbreeding in a population1. Why do you think it is necessary for there to be variation in a population in order for evolution by natural selection to occur? 2. Why is it necessary for traits to be inherited for evolution to take place? 3. If a population is already well adapted to its environment, will most mutations be helpful or harmful? Explain.
- 1. What kinds of limited resources can create a struggle between individuals in a population? 2. What kinds of variable traits within a population might natural selection act upon? Use a finch population as an example.1. Describe what you think would happen if a male mouse acquired a mutation that gave it tan or a sandy colored belly AND female mice wanted to mate with this more about 1 % more than a male mouse with a white belly? 2. Now, suppose that the females were really wild about the sandy colored belly of this male mouse. The females wanted to mate with this lucky mouse about 10% more than males with a white belly? What would happen to the frequency of sandy colored bellies in this population over time? 3. What is the selective pressure at work in questions 1 & 3? 4. Describe what this statement means: "The division of humans into races by using skin color is an arbitrary social construct." 5. What are melanosomes? Name the cell type that produces melanosomes. 6. What happens to melanosomes after they are released into keratinocytes? 7. List the three factors that work together to create the range of skin colors we see today. 8. Describe the main function of keratinocytes and of…1.A) Adaptations to a Changing Environment• Explain why it is necessary for organisms to have the ability to adapt.• Why is the current environment making it difficult for organisms to adapt?• Explain how organisms develop adaptations.2. B) Artificial Selection• Explain how artificial selection is like natural selection.• Why are quail useful subjects for an experiment on selection? What other organisms share similar characteristics?
- 2. What is the role of variation in evolution – if heterozygosity is reduced, what happens to the potential for evolution? The phenotype (and genotype) of a population is due to a "mosaic" of random and directed processes. Some of these have to do with history; some are related to adaptation, etc. As completely as possible, discuss the role of chance and direction in evolution and in determining the phenotype of a population.Which of the following evolutionary forces can introduce new genetic variation into a population? natural selection and genetic drift mutation and gene flow natural selection and nonrandom mating mutation and genetic driftOne of the original Amish colonies rose from a ship of colonists that came from Europe. The ship s captain, who had polydactyly, a rare dominant trait, was one of the original colonists. Today, we see a much higher frequency of polydactyly in the Amish population. This is an example of: natural selection genetic drift founder effect b and c
- If a population of skunks includes some individuals with stripes and others with spots, would you describe the variation as quantitative or qualitative?Which of the following situations will lead to natural selection? The seeds of two plants land near each other and one grows larger than the other Two types of fish eat the same kind of food, and one is better able to gather food than the other Male lions compete for the right to mate with females, with only one possible winner all of the above1. A sample of 600 individuals from a population is examined for the presence of the HindIII polymorphism in an autsomal Sca gene. There are two alleles of Sca gene, A and a. The results are 14 individuals are AA, 212 are Aa, 374 are aa. Please answer the following questions accordingly? How many alleles are present in the gene pool in the sample population fort he Sca gene? What are the genotype frequencies? What are the frequencies of A and a alleles? What are the expected numbers of the three genotypes, assuming random
