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Biology help. Evolution?

1. After which event could you say with most certainty that evolution has occurred? (Points: 3) An allele frequency changes in a population. An animal does not grow to its potential. A green-eyed fly is born into a population of brown-eyed flies. A new predator comes into an environment. 2. In which scenario could natural selection most obviously occur? (Points: 3) an island with lizards that all look alike and are all eating the same food a population of salmon with different skin colors that are involved in attracting mates all insects in a certain desert that have the same adaptation for saving water a population of parakeets that have the same size beak 3. Which group of organisms can be considered a population? (Points: 3) a group of skunks living in the same forest all buffaloes in North America different kinds of butterflies living in the same patch of rain forest freshwater salmon 4. A population of white-tailed deer inhabits a certain patch of forest in Michigan. Which group of alleles can be considered the gene pool of those deer? (Points: 3) the dominant alleles of all white-tailed deer the dominant alleles of the white-tailed deer in this population only the alleles of all white-tailed deer the alleles of the white-tailed deer in this population only 6. Which sentence best represents the process through which evolution occurs? (Points: 3) Mutations lead to disease. Organisms that are fit survive and reproduce. Allele frequencies do not change. Organisms always exhibit dominant genes. 7. Natural selection acts on the variation in populations of living things, usually through a specific trait. Which statement must be true about that trait? (Points: 3) The trait is the same for all organisms. All forms of the trait have the same impact on survival. The trait is resistant to mutations. The trait is passed on genetically to the next generation. 8. A population of snails is experiencing disruptive selection in terms of their shell patterns. Which statement is most likely true about the population? (Points: 3) Two different shell patterns are combining into one very common pattern. Snails with the most common shell pattern are surviving in greater numbers than snails with all other shell patterns. Snails with a new shell pattern are surviving in greater numbers than snails with all other shell patterns. Snails with two different shell patterns are surviving in greater numbers than snails with the most common shell pattern. 9. A family of raccoons living in the center of a forest leaves that area and joins a population of raccoons living near the edge of the forest. Over a period of years, a certain trait in the raccoon population living near the edge of the forest becomes more common. What factor caused the raccoon population to evolve? (Points: 3) migration genetic drift mutation genetic recombination 10. A bird's wing, a dolphin's fin, and a cat's paw are homologous structures. How do those structures support the theory of evolution? (Points: 3) They prove that the limbs of all land animals evolved from wings and fins. They all have similar sizes and functions. They are evidence that the animals had a common ancestor. They are good examples of vestigial structures. 11. How does comparing the embryos of different organisms support the theory of evolution? (Points: 3) The embryos of any group of living things resemble the other embryos in that group. The embryos of all organisms are identical. The stages of development of the embryos of certain organisms are extremely similar, a fact that suggests the organisms had common ancestors. 12. Which sentence best describes vestigial structures? (Points: 3) They may have had an important function in the past. They are necessary for an organism's survival. All animals have them. They contain genetic mutations. 13. Fossil evidence suggests that whales evolved from land mammals. Using comparative DNA techniques, scientists have also suggested that whales are related to hippos. How could comparing amino acid sequences support the theory of evolution? (Points: 3) Comparing amino acid sequences showed that stabilizing selection took place in a population of hippos, resulting in the formation of a new species of whale. By comparing amino acid sequences, scientists were able to prove that ancient whales had the same DNA base pairs as ancient hippos. Comparing amino acid sequences can show close genetic relationships between organisms that may appear very different, such as whales and hippos.

Public Comments

1. 1. An allele frequency changes in a population. 2. a population of salmon with different skin colors that are involved in attracting mates 3. a group of skunks living in the same forest 4. the alleles of the white-tailed deer in this population only 6. Organisms that are fit survive and reproduce. 7. The trait is passed on genetically to the next generation. 8. Snails with two different shell patterns are surviving in greater numbers than snails with the most common shell pattern. 9. genetic drift 10. They are evidence that the animals had a common ancestor. 11. The stages of development of the embryos of certain organisms are extremely similar, a fact that suggests the organisms had common ancestors. 12. They may have had an important function in the past. 13. Comparing amino acid sequences can show close genetic relationships between organisms that may appear very different, such as whales and hippos.