Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Godfrey Hardy and Wilhelm Weinberg stated the principle of equilibrium to describe the genetic makeup of a population. The theory, also known as the
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Mutations
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Selection pressure
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Migration
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- In the modern reckoning of evolution by natural selection, what is the most important feature that allows an allele to be more represented over time in a population? The allele makes the organisim stronger. The allele allows the organisim to produce more breeding offspring. The allele allows the organisim to eat more readily. The allele allows the organsims to escape predators readily.arrow_forwardFive conditions are required to maintain the Hardy–Weinberg equilibrium in a population. Closed population Large population Random mating No net mutations No natural selection If any of these conditions is not being met, the allele frequencies in the population will change, leading to microevolution in the population.Match each of the following scenarios to the Hardy–Weinberg condition that is NOT being met:An increase in antibiotic resistance among bacteria exposed to antibiotics occurs. AnswerCaribou from one herd move to a new area and breed with caribou of a completely different herd. Answer Among eastern bluebirds, more brightly coloured males breed with more brightly coloured females. AnswerDue to overhunting, there is little genetic diversity in the current population of bearded vultures, which have all descended from a population of only 36 birds. Answerarrow_forwardWhich of the following statements is CORRECT regarding models of adaptation that invoke allele-frequency adaptive landscapes? They assume that natural selection can either increase or decrease population mean fitness as long as there is no genetic dominance at any of the loci. They assume that natural selection can only increase population mean fitness, which means that populations can get "stuck" on local peaks associated with lower fitness than the global optimum. We can assume that such landscapes have multiple peaks only when there is no epistasis for fitness among any of the loci under consideration.arrow_forward
- If a population were to remain in Hardy Weinberg Equilibrium, which of the following is correct? If a population were to remain in Hardy Weinberg Equilibrium, which of the following is correct? The population can still grow, but the allele frequencies will remain constant in each generation The population can still grow, but the allele frequencies may change with each generation Since it is at equilibrium, the population cannot growarrow_forwardEvolution determines the change in inherited traits over time to ensure survival. There are three variants identified as Variant 1 with high reproductive rate, eats fruits and seeds; Variant 2, thick fur, produces toxins; and Variant 3 with thick fur, fast and resistant to disease. These variants are found in a cool, wet, and soil environment. In time 0 years with cool and wet environment, the population is 50,000 with 10,000 Variant 1, 15,000 Variant 2, and 25,000 of Variant 3. Two thousand years past, the environment remained the same with constant average temperature and rainfall. Variant 1 with a population of 26,000, Variant 2, 35,000, and Variant 3, 62,000. A disease spread throughout the population. However the population increased to 72,000. Determine the percentage increase in the population of the variants.arrow_forwardIn a species of lily, the color of the flower's petals is determined by a dominant purple allele (F) or recessive white allele (f). One hundred flowers in Hardy-Weinberg equilibrium were sampled, and only 15% of the population showed the phenotype of white. Which of the following numbers represents the calculated value of the recessive white allele frequency? 0.92 0.39 0.15 0.85arrow_forward
- If both mutation and drift are acting simultaneously, predict how this will influence variation in that population. Will variation increase, decrease, or be maintained at some equilibrium, etc.? (note: consider how mutation and drift each affect variation within a population).arrow_forwardHippogriffs can have black fur or gray fur. However, there is a high rate of mutation from black alleles into gray alleles. In a population of 1000 hippogriffs, if there are 600 alleles for black fur and the forward mutation rate (ie., from black to gray) is 10%, approximately how many black alleles should be expected in the next generation? Group of answer choices 60 540 300 10 660arrow_forwardSeveral generations of population X have been studied. The dominant allele frequency for the second generation of population X was calculated to be 0.27. The tenth generation for population X has been collected and the dominant allele frequency is 0.73. Is population X evolving? Explain your answer(s).arrow_forward
- Consider a gene with two alleles, C and M. The table below describes fitness for different genotypes in two populations. Fitness CC CM MM Population 1 1.0 1.0 0.6 Population 2 0.9 0.9 1.0 Assume that both populations begin with frequencies of 0.5 for each allele, population size is infinite, and there is no migration between populations. Which of the following statements is true based on the information you have on these populations?arrow_forwardA hypothetical population has two alleles for a “B" gene: B1 and B2. In a random sample of 50 diploid zygotes (for a total of 100 alleles), the following genotypes were found: 20 B1B1, 20 B1B2, and 10 B2B2 The above values represent the initial genotype frequencies of zygotes in the population. Let's say that selection acts against the B2 allele, and all 10 individuals with B2B2 genotype die off before reaching maturity (leaving 0 B2B2 individuals). (The number of surviving adults in the population is 40, so the number of alleles is 80). What is the new observed frequency of the homozygous dominant genotype? O A. 0.10 О В. О.70 O C. 0.25 O D.0.50 O E. 0.75arrow_forwardA population consists of 100 individuals of the following genotypes: AA 55 0.14 0.2 0.25 0.35 0.55 0.65 Suppose the relative fitnesses of AA, Aa, and aa are 1, 0.5, and 0.2 respectively. Apply selection to the original starting population described above (55, 20, 25). What is the frequency of the a allele after selection? O O O Aa 20 0.75 0.8 aa 25 ▬ Q Search e U C 99+ 859 20 A 5arrow_forward
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