Lab 12 Evolution Copmuter Lab

Lab 12 Evolution Copmuter Lab - EVOLUTION OF DARWIN'S...

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EVOLUTION OF DARWIN’S FINCHES Lab 12 12-1 Reminders ! Calculator Memory Stick or Floppy Disk This assignment will still be due in one week despite not meeting for next week’s lab. Ask your TA for details. By now you should have purchased the Evolution On-line Lab Manual, USED VERSIONS DO NOT WORK (the username and password have been reset by the publishing company). If you bought a manual with a partner, be sure that both parties have read it in order to prepare for class! To access the lab type in the web address: http:// biologylab.awlonline.com/ For first time only, you will need to register and set up your username & password. To register, click on: You are then asked to enter the access code to initialize your subscription, which is good for one year from the starting date. The access code is located on the first page of the manual. Click on the Evolution Lab link back on the main page (at http://biologylab.awlonline.com/) to begin the lab and then login by entering your username and password. Follow the assignments in this manual and refer to the On-line Manual only when asked. The Evolution On-line Manual allows you to export Graphs and data into Excel. Graphs can also be inserted into a word document by pressing the ‘Print Screen’ button to capture the graph and then use the paste command in Microsoft Word. In the following exercises you will investigate natural selection of finches on Darwin and Wallace islands in the Galapagos. This computer simulation is based on many decades of ecological field research focused on how the finches respond to a changing environment. In the simulation, you will adjust environmental parameters such as rainfall and island size, phenotypic and genetic variables such as beak size and heritability, and observe their effects over time on finch populations. The amount of rainfall affects the type of seeds that are produced by plants on an island (see Table I). Hard seeded plants survive better in a dry climate because the embryo is better protected from desiccation, while soft seeded plants survive better in a wet climate because they can often germinate more quickly. Obviously, the finches’ beak structure determines the type of seeds that they can consume (see Table II). A finch with a thick, broad beak can crack open large, hard seeds but it is inefficient at handling smaller, soft seeds compared to a finch with a smaller beak (recall the Optimal Foraging Lab). Table I. Optimal growing conditions for seeds grown on Darwin and Wallace Island. Seed Type Optimal Growth hard dry intermediate moderate soft wet Table II. Finches seed use efficiency based on beak type. Beak Type Seeds Thick (deep) Hard Small (shallow) Soft The default settings for the On-line Manual are as follows: Beak size = 12 mm Variance = 1 Heritability = 0.7 Clutch Size = 10 Island Size = 0.5 km Population Size = 200 Precipitation = 20 cm
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Laboratory 12 Evolution of Darwin’s Finches 12-2
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Laboratory 12 Evolution of Darwin’s Finches 12-3 NAME : _________________________________ Assignment 1
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Lab 12 Evolution Copmuter Lab - EVOLUTION OF DARWIN'S...

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