NS102%20Study%20Problems%20Set%2018

NS102%20Study%20Problems%20Set%2018 - NS102 Study Problems...

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1 NS102 Study Problems Set 18 The set contains study problems and exam questions from the previous semesters on Evolution and Population Dynamics. 1. (Exam Archive) What are four pieces of evidence that make scientist use to argue for evolution by natural selection? Answer: Relatedness, evolutionary sequence, homology, vestigial organs 2. (Exam Archive) A population of snails has recently moved to a new region. The snails are preyed on by birds that break the snails open on rocks, eat the soft bodies, and leave the shells. The snails occur in both striped and unstriped forms. In one area, researchers counted both live snails and broken shells. Their data are summarized in the table. Striped Unstriped Total % Striped Living 264 296 Broken 486 377 (a) Complete the table. (b) Based on these data, predict if the frequencies of striped individuals will increase or decrease over the generations, if the current environmental condition do not change. Explain why. (c) The presence/absence of stripes on the snails is determined by a single gene, where the dominant allele is striped. Combining data from both the living snails and broken shells, calculate the frequency of the dominant allele, and the number of heterozygotes in the observed groups. ( Hint: Use the Hardy Weinberg relationship) Answer: (a) Living Total=560 %Striped =47 Broken Total=863 %Striped=56 (b) the
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NS102%20Study%20Problems%20Set%2018 - NS102 Study Problems...

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