Homework #3

EEMB 160 : The Neural Basis of Behavior, "Neurobehavior"

NAME:   Due: May 26 (Friday) in lecture!! Covers approximately lectures 5/1 through 5/24 & all associated readings. Covers discussion sections from 6th & 7th week See lecture outlines!! 25 points total You can complete this assignment through the web site and then print it to turn it in. (Try clicking on the buttons to choose your answer on the multiple choice questions and type your short answers or single word answers in the text boxes provided below the question.) IF YOU DO DECIDE TO PRINT YOUR ANSWERS VIA THE BROWSER, PLEASE BE SURE TO PROOFREAD THE ASSIGNMENT BEFORE TURNING IT IN TO MAKE SURE ALL YOUR ANSWERS APPEAR, ESPECIALLY THE MULTIPLE CHOICE ANSWERS! Also, links (underlined, blue text) within the questions or answers are NOT indicating the answer, but take you to a part of a module that might help you with the question. Address: http://lifesci.ucsb.edu/~mcdougal/neurobehavior/modules_homework/2000hw3.html A note about doing your assignment on-line, WATCH OUT FOR NETSCAPE OR INTERNET EXPLORER CRASHING IN THE MIDDLE OF YOU TYPING IN YOUR ANSWERS (YOU'LL LOSE ALL YOU'VE TYPED)!! It might be a good idea to have some answers written out or have them pasted into a program that is saveable (like Word or a text editor). Also, after you print your assignment, look through it to make sure all your answers printed. Also, make sure the right margin is not cut off, truncated your answers. Printing Instructions: If you use Internet Explorer you should just be able to print away (might want to make sure that "fit to page" is checked under Print Preview mode. If you have Netscape, all bets are off--I'll try to make the page skinny enough to fit on one page. Then go to print. WRITE (OR TYPE) YOUR ANSWERS ON THIS SHEET!!

1. [3 pt] One reason bioluminescence (BL) is so prevalent in the ocean is that it has many uses. Examining some of these, why do you think BL is so much rarer on land?   2. [2 pt] Describe 3 pieces of evidence that supports the hypothesis that BL evolved ~30 different times.   3. [2 pt] Describe 2 pieces of evidence that supports the hypothesis that BL and vision are evolutionarily linked.   4. [2 pt] Fireflies are one of the few terrestrial organisms to use bioluminescence. They use bioluminescence as a means of between males and females of the same species for mating. There are many firefly species on the East Coast of the United States that all live mixed together in one area. To ensure same-species mating, the males have evolved a certain that is characteristic to its species. The female of this species will respond only when she recognizes this. In Malaysia there are fireflies of one species that coordinate their bioluminescence flashes. They are known as . Thousands of individuals can quickly coordinate their flashes so that they are all flashing in unison—without a leader starting the whole process. This phenomenon is known generally as . The Malaysian fireflies are thought to coordinate their flashing in order to .   5. [2 pt] Choose 2 "stories" describing two different uses of BL. Describe the use or function of BL, then discuss the selective pressure(s) that may have been important in the evolution of this use of BL.   6. [1 pt] True/False. Bees have a higher resolution spatial map of the area near their hive vs. the area further away from their hive. Explain why or why not in one sentence. True False   7. [2 pt] What is the difference between the way bumble-bees inform other bumble-bees of a good food source and the way honeybees inform their cohorts of a good food source.   8. [2 pt] What did the Y-maze experiments indicate about honeybee learning?   9. [2 pt] (a) Describe the relationship that this graph indicates. (b) What does this indicate about a honeybee’s visual odometer.   10. [2 pt] Why has evolution selected a mechanism in which a bee only learns to associate a particular odor with sucrose presentation (as indicated by proboscis extension) when the odor is provided before the sucrose and not in the reverse order? 11. [3 pt] Briefly describe 5 pieces of information that a honeybee uses to locate a previously visited particular species of flower.   12.[2 pt] Draw the two waggle dances that would result from one forager finding food source A and another forager finding food source B. Describe the key differences coded within each dance. This assumption applies for when you are drawing the waggle dances, not for the alignment of the hive as it is shown in this drawing.     Return to Modules & Homework Page Return to Home Page