Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Under what scenaries is genetic drift most potent as an evolutionary process? how do factors like
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- 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_forwardWhich of the following is the LEAST CONVINCING argument against micromutationism? Advantageous mutations of large effect are more resistant to loss by drift than advantageous mutations of small effect. Mutations of small effect are more likely to be advantageous than mutations of large effect. Empirical studies suggest that some adaptive traits are governed at least in part by loci of large phenotypic effect.arrow_forwardWhat is the importance of heritability in natural selection?arrow_forward
- Evolution is driven by both nonrandom and random mechanisms. Identify the mechanisms of evolution that are random and comment on how they affect allele frequencies across generations.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_forwardWhich of the following comparisons of relative fitness for the M locus would most likely result in the fixation (frequency of 1 ) of the M allele after many generations of evolution. A. w(MM) = w(Mm) < w(mm) B. w(MM) < w(Mm) > w(mm) C. w(MM) = w(Mm) = w(mm) D. w(MM) > w(Mm) = w(mm)arrow_forward
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