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lecture 8 coevolution

lecture 8 coevolution - ROOM CHANGE FOR REVIEW SESSION EXAM...

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ROOM CHANGE FOR REVIEW SESSION EXAM 1 Review Session Tuesday, September 25 6:00 pm CNS 112 This will be an informal review session. Bring your questions!
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Thu Aug 30 Intro What is evolution- and why does it matter to me? Chapter 1 Tu Sept. 4 Evidence for Evolution Chapter 6 pp 28-38 Th Sept 6 Emergence of Life Bring PRS Clicker to Class!!! Chapter 4 http://www.livescience.com/animals/0604
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In a population of groundhogs, the genotype for blue eyes is homozygous recessive bb. If 9% of the population have blue eyes, what is the frequency of the gene b? A.0.3 B.0.0081 C.0.18 D.0.7
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p 2 + 2pq + q 2 = 1 Frequency of alleles p = ? q = ? Frequencies of genotypes? p 2 = 2pq = q 2 =
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Given the same scenario as in the previous question, what is the frequency of the heterozygous genotype Bb? A. 0.1638 B. 0.49 C. 0.09 D. 0.42
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p 2 + 2pq + q 2 = 1 Frequency of alleles p = ? q = ? Frequencies of genotypes? p 2 = 2pq = q 2 =
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LINK
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We have radio-tracked toads at the invasion front 60 km east of Darwin and confirmed the astonishing locomotor performance in these animals, which move up to 1.8 km per night during the rainy months — far further than previously studied anurans. Introduced to Queensland in 1935, cane toads have since expanded their range to encompass more than a million square kilometres of tropical and subtropical Australia. LINK
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Does this remarkable ability result from selection for enhanced dispersal during the toads' Australian colonization history?
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Is there selection for ____________________ in Cane toads? A. Early arrival C. Distance travelled B. Leg length D. Time since colonization
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If the invasion process has been assisted by the evolution of improved dispersal ability among toads at the front, three consequences would be expected. First, longer-legged toads should be disproportionately common among the first wave of arrivals at any site. As the toad invasion front passed our study site, we measured relative leg lengths of all toads encountered over a 10-month period. Longer-legged toads were the first to pass through, followed by shorter-legged conspecifics. Longer-legged toads therefore moved faster through the landscape .
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Second, toads at the invasion front should be longer-legged than toads from older populations . As predicted, longer-term historical analysis within Queensland populations shows that relative leg length is greatest in new arrivals and then declines over a 60-year period.
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Third, the rate of progress of the toad invasion front should increase through time . As predicted, rates of frontal progress have consistently increased. Toads expanded their range by about 10 km a year during the 1940s to 1960s, but are now invading new areas at a rate of over 50 km a year. Previous predictions about the time course of future expansion of the toads' range seriously underestimate their actual rates of movement.
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Why are there deleterious genes in a population?
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Deleterious Genes A “perfect” population would not carry any deleterious genes—but as we’ve already seen, natural selection does not produce a perfect population.
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