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NaturalselectionbyamoebasistersWorksheet

Amoeba Sisters recap on natural selection: Populations have trait variety; predators select against visible traits, changing allele frequencies and driving evolution in isolated populations.

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    Amoeba Sisters I video Recap WA*HE __________________________________ Amoeba Sisters Video Recap: Natural Selection 1. Populations tan have variety, despite being made up of the same species. If a population has different expressed traits, this can be due to different inherited alfefes. The frogs below are the same species, but they have different shades of green based on their inherited alleles. In a particular environment, lighter green frogs are easier to see by predators. Explain how natural selection could lead to a change in allele frequency. Natural selection occurs w hen slides that enhance tne rm ss oi the mdividuais trial tarry then rise in trequei .1y A change In the —d'.olo hoqut-ficy of a population is evolution If--------- a populabon becomes isolated from other populations of the same sorci es. there wil: be no qi'iiL' Row between tlio isolated population arid the others 2. Natural selection is an examp e of a mechanism of evolution. Does th s mechanism produce a change in individuals or papulations? Explain! cause changes in the frequencies of genes in populations, and so all of them are mechanisms of evolutionary change, However, i laiuryl yyieaiun aid yyrieliu drift caririul-------- operate unless there is genetic variation - that ib. unless some Individuals die genetically ------ different from others. 3. A major point of understanding natural selection is that not all organisms in a papulation get to reproduce. Consider the term fitness as used in biology. How dees this term relate to natural selection? The term fitness refers to the measure of reproductive success that an organism displayed, it has to do with the number of offspring thai an organism leave in lhe next generation compared io other organisms in the group. Papulations usually evolve by natural selection. In nii'urat selection. organisms with inheritable traits, which help them to survive and reproduce tend to leave more children ihan rhe other organisms, overtime, the feature rhui M p th* organisms to survive will ------ become more common m the population and make the animals more suited to their habitats 4. Based on your answer above, do organisms with higher fitness mea n that they have survived to an advanced age? Why or why not? r tr ess re i? tn r aturai .c- «>cticu'i in how the organisms that get to survive and reproduce are the ones 11.at are (he fitter,

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