Evolution – Station Reviews: Part Two

Bell Work Explain what “Common Descent with Modifications” means. Pick up today’s worksheet up front

Station 1: Patterns of Natural Selection List the three graphing patterns seen with natural selection? Which natural selection pattern does scenario 1A describe? Which natural selection pattern does scenario 1B describe? Which natural selection pattern does scenario 1C describe?

Scenario 1A For birds and parasitoids, females that lay close to the Lack optimum number of eggs have the most surviving offspring. Those that lay fewer or more eggs have lower relative fitness.

Scenario 1B A population of Madagascar hissing cockroaches lives in a woodpile. It suffers heavy predation from lizards. Because their heads are small, the lizards are unable to eat the very largest adult cockroaches, and instead prey upon small and medium sized adults. What type of selection do the lizards impose on the roaches?

Scenario 1C If a cow develops a preference for eating white four o’clock flowers and ignoring pink and red four o’clock flowers, what type of selection is being demonstrated?

Station 2: Patterns of Natural Selection Label the graphs with the correct pattern of natural selection. Graph 2A = __________________________ Graph 2B = __________________________ Graph 2C = __________________________

Graph 2A

Graph 2B

Graph 2C

Station 2: Macroevolution vs. Microevolution Which category of evolution studies the emergence of new species? Which category of evolution studies the change in allele frequencies within a population?

Station 3: List the 4 major sources of genetic variation for a population. ____________________ reproduction Genetic ____________________ ____________________ (event that occurs during prophase I of meiosis) _____________________ assortment of chromosomes

Station 3: Microevolution What type of microevolution is occurring between these populations? _____________________ The beetle is ____________________ from population B and _________________ into population A. (Fill in the blank with the two types of gene flow) Pop. A Pop. B

Station 3: Microevolution Which type of microevolution does this picture show?

Station 4: Speciation ___________________ isolation is required for speciation to occur. ______________ speciation = a geographic barrier separated the population ______________ speciation = occurs without a geographic barrier

Station 4: Speciation What type of sympatric speciation has occurred when they don’t recognize the mating behaviors anymore? What type of sympatric speciation has occurred when they no longer breed at the same time of year? What type of sympatric speciation has occurred when they don’t breed within the same habitat anymore? What type of sympatric speciation has occurred when their reproductive anatomy no longer fits together?