A population of alpacas all have an identical fur length phenotype. During a particularly cold winter, longer fur would be beneficial as it would provide them with greater insulation. Select the correct answer given this information. The alpacas will evolve by natural selection as longer hair would be favorable in their environment. A mutation for longer fur will likely develop in this population. Alpacas with longer fur will likely migrate into this population as they have a beneficial phenotype for the cold winter environment. The alpacas will not evolve by natural selection for fur length phenotype.
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- Often successful domestication of a plant or animal is due to the fact that this involved just a few gene changes. In what situation can changes in just a few genes dramatically change an organism's entire appearance?Background: In class we did a project about m and m’s and there ability to evolve and natural selection. (Yes I know they can’t actually evolve it was just used as a example in class) however I can’t figure out this question. Occasionally a mutant may occur and produce a candy that is misshapen or Pointier or flatter than the rest. Often this proves to be a weakness, but a rare mutation may confer extra M&M durability. Other mutations in M&Ms could occur ( like ones that result in a new color). A mutant un you population represents a new _________. What goes in the blankn class we investigated the reason cystic fibrosis is maintained in the human population in higher frequency than we expected given the deleterious effects of being homozygous at the CFTR gene. We calculated the actual mutation rate of the CFTR gene to be 6.7 x 10-7. The mutation rate expected under mutation-selection balance was 4 x 10-4. What is the most plausible explanation as to why cystic fibrosis is maintained in the human population at a higher frequency than we expect? a. Negative selection against the CFTR deleterious alleles is too weak to eliminate the alleles from the human population. b. Positive selection for the CFTR deleterious alleles is likely occurring in response to some other selective pressure in the human population, possibly resistance to typhoid fever. c. The CFTR gene has an exceedingly low mutation rate causing humans to have no genetic variation at that gene. d. The CFTR gene has an exceedingly high mutation rate and that is…
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- A species of mouse lives in California. One day 50 of these mice sneak onboard a boat and are taken to an island in the middle of the ocean with no mice on it. These mice find plenty of food to eat on this island and survive to produce fertile offspring even though this population has much less genetic diversity than the populations back in California. Over time on this island, a mutation gives some mice better night vision, and they start to hunt and eat insects that are only active at night and they sleep during the day. Another mutation gives some mice longer claws and they start to eat the seeds that only grow up in the tops of trees. What mechanism may lead to reproductive isolation and the eventual speciation in these mice? Group of answer choices Behavioral isolation Hybrid breakdown Gametic Isolation Mechanical Isolation Temporal IsolationThis figure can be used to represent the sequence of events leading to the evolution of dark-furred mouse populations living on lava flows in the southwest. Which statement is false when considering evolution of these pocket mice? The different size hexagons represent neighboring populations. The color change in the smaller hexagon indicates the phenotypic divergence due to natural selection. Darker fur is due to environmental conditions on the lava flow, like the intensity of UV radiation. Natural selection favored the darker fur, which increased the frequency of mutated alleles in the population. TimeA species of mouse lives in California. One day 50 of these mice sneak onboard a boat and are taken to an island in the middle of the ocean with no mice on it. These mice find plenty of food to eat on this island and survive to produce fertile offspring even though this population has much less genetic diversity than the populations back in California. Over time on this island, a mutation gives some mice better night vision, and they start to hunt and eat insects that are only active at night and they sleep during the day. Another mutation gives some mice longer claws and they start to eat the seeds that only grow up in the tops of trees. Which of the following processes are influencing the allele frequencies of all mice on this island? Group of answer choices Gene Flow and Mutation Selection, Genetic Drift, and Mutation Gene Flow, Mutation, and Selection Selection Gene Flow and Mutation
- In a population of yellow mushrooms, a mutation resulted in a new purple type of mushroom that herbivores avoided. Because herbivores avoided the purple mushrooms, they were able to spread more spores and increased to make up 1% of the population. In one year, however, flash flood killed all of the purple mushrooms in the population, leaving only a few yellow mushrooms alive. Identify which evolutionary mechanism was responsible for the fixation of the yellow mushroom genotype in this population. Select one: a. Mutation b. Genetic drift c. Non-random mating Ⓒd. Natural selection * Gene flow e.Certain species of blind fish living in perpetual darkness in the ocean depths have evolved from ancestors that could see. Research indicates that the brain centers for vision in these fish is degenerating, whereas the brain centers controlling other senses are enlarging. What might be the MOST probable reason for the loss of vision in these fish? O A. exposure to mutagens that caused the loss of vision B. progressive selection of genetic variants in the population leading to blindness as an evolutionary adaptation C. infection by cave-dwelling microorganisms that has led to degeneration of the eyes O D. extreme high pressure at the ocean depths causing a deterioration of visionChoose an organism that is a product of artificial selection. Give a brief description of your organism and its desired traits. What wild ancestor did it come from? Was it produced with selective breeding or genetic engineering (i.e. genetically modified)? What are the benefits of artificial selection in this case? Are there potential negative consequences?