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- Regardless of the rate of evolutionary change, the product of genetic alterations is ultimately tested by Natural Selection. Gradualism accounts for the constant yet slow linear modification of a population while punctuated equilibrium accounts for long periods of stasis followed by rapid divergence (multiple forms emerging). -First, in no more than two sentences, explain Natural Selection (use your own words).-Second, explain the dynamics of selection. If natural selection acts on individuals, how might itshift allele frequencies in a population?-Third, explain gradualism and punctuated equilibrium in terms of selection. When discussingpunctuated equilibrium, remember that selection is still active in times of stasis#21 Answer the following questions about evolution. Number responses according to the questions (1-4). (short answers are fine) How can negative traits that don't show up until old age continue in populations? (Why aren't they eliminated through natural selection?) As part of answer, provide an example. Imagine a population of mice living in a grey, rocky environment. Some mice are grey and some are brown. If natural selection occurs in this population, what would someone expect to see if you returned in 100 mouse generations? Describe what someone see in terms of fur colors in the population. Imagine a population of mice living in a grey, rocky environment. Some mice are grey and some are brown. If mutations occur in this population, what could someone see if they returned in 100 mouse generations, that would tell them mutations had occurred? Describe what they would see in terms of fur colors in the population, and how it would be different from what they would see in #2. If…#21 Answer the following questions about evolution. Number responses according to the questions (1-4). How can negative traits that don't show up until old age continue in populations? (Why aren't they eliminated through natural selection?) As part of answer, provide an example. Imagine a population of mice living in a grey, rocky environment. Some mice are grey and some are brown. If natural selection occurs in this population, what would someone expect to see if you returned in 100 mouse generations? Describe what someone see in terms of fur colors in the population. Imagine a population of mice living in a grey, rocky environment. Some mice are grey and some are brown. If mutations occur in this population, what could someone see if they returned in 100 mouse generations, that would tell them mutations had occurred? Describe what they would see in terms of fur colors in the population, and how it would be different from what they would see in #2. If dark skin helps protect…
- Genetic variation is the product of completely random events, but acting upon this randomness is a very nonrandom process called natural selection. Explain or give an example.The dog breed West Highland Terrier is a product of artificial selection. Give a brief description of the breed 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?Book: Greatest Show on Earth Answer both question below. Explain what Dawkins says selection is acting on in chapter 2 and how that variation is distributed throughout a population (gene pool) (blending vs. independent assortment). -150 word minimum In chapter 3, Dawkins suggests that selection is powerful yet unconscious of its actions ("without any understanding at all"). He uses a variety of examples to highlight how various organisms drive selection, sometimes consciously and sometimes unconsciously, by mediating the breeding process. Using one of the examples explain how some organisms unconsciously drive the selection of others. -150 word minimum
- 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 blankWhich of the following changes or mutations can be acted upon by natural selection? For each choice, select yes or no. UV radiation induces a mutation in skin cells, [ Choose ] causing uncontrolled cell growth Long-term exposure to toxic aerosols in cigarette smoke causes mutations in the cells [ Choose ] lining the lungs Eugene residents develop an increase in red blood cell count while backpacking in the Cascade mountain range [ Choose ] Excessive exposure to X-ray radiation induces mutations in the sperm cells of some [ Choose ] hospital workers > > >Consider the four postulates of natural selection. How have humans manipulated each of these postulates in natural or artificial systems?
- Remember that understanding is explanations more than facts. Definitions of phenotype, genotype, allele, gene, microevolution, macroevolution Know that in humans, most of the genetic variation is observed within populations, and know why that is. Know the 4 processes of evolution (3 neutral + natural selection) Know that evolution isn't progressive and doesn't necessarily lead to more complexity Know that evolution can lead to traits that decrease survival (ex: sexual selection) Know that quantitative traits are generally influenced by (i) many genes, each having a small effect on the trait value; and (ii) the environment What is F1 like when you cross 2 homozygotic lines of peas of different colors? What is F2 like when you cross F1 individuals (remember what 9:3:3:1 is about) Know what genetic dominance is about Definitions of chromosome, nucleus, mitosis, meiosis, crossing over How many chromosomes in humans? How many pairs of chromosomes? Know and apply Hardy-Weinberg's equation…In order for a trait to evolve via natural selection, which of the following must be true regarding the trait? (this is a multiple answer question - so select all correct) Group of answer choices There must be variation in the trait. The trait must make the organism survive longer than organisms with different traits. The trait must confer a reproductive advantage on the bearer of the trait. The trait must be heritable. The trait does not necessarily need to be passed down to offspring.What causes variation among a population of living things and How can variation in one generation influence the next generation? Is the variation in a population will be examined as the “raw material” upon which natural selection acts. Why are there so many different kinds of living things? Comparing species that exist today reveals a lot about their relationships to one another and provides evidence of common origins. This session explores the theory of evolution: change in species over time.