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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 RecapWA*HE __________________________________Amoeba Sisters Video Recap:Natural Selection1. Populations tan have variety, despite being made up ofthe same species. If a population has different expressedtraits, this can be due to different inheritedalfefes. Thefrogs below are the same species, but they have differentshades of green based on their inherited alleles. In aparticular environment, lighter green frogs are easier to seeby predators. Explain how natural selection could lead to achange inallele frequency.Natural selection occurs when slides thatenhance tne rmss oi the mdividuais trialtarry thenrise in trequei .1y A change In the—d'.olo hoqut-ficy of a population is evolution If---------a populabon becomes isolated from otherpopulations of the same sorci es. there wil: beno qi'iiL' Row between tlio isolated populationarid the others2.Naturalselection is an examp e of a mechanism ofevolution.Does th s mechanism produce a change inindividualsorpapulations?Explain!cause changes in the frequencies of genes inpopulations, and so all of them aremechanisms of evolutionary change, However,i laiuryl yyieaiun aid yyrieliu drift caririul--------operate unless there is genetic variation -thatib.unless someIndividualsdie genetically------different from others.3. A major point of understanding natural selection is that not all organisms in apapulation get to reproduce. Consider the term fitness as used in biology. How deesthis term relate to natural selection?The term fitness refers to the measure of reproductive success that an organism displayed, it hasto do with the number of offspring thai an organism leave in lhe next generation compared io otherorganisms 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 morechildren ihan rhe other organisms, overtime, the feature rhui M pth* organisms to survive will ------become more common m the population and make the animals more suited to their habitats4. Based on your answer above, do organisms with higher fitnessmea n that they have survived to an advanced age? Whyor why not?r tr ess rei? tnraturai.c- «>cticu'i in how the organisms that get to survive andreproduce are the ones 11.at are (he fitter,
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Biology

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