Presentation on theme: "Several key insights led to Darwin’s idea for natural selection."— Presentation transcript:
1 Several key insights led to Darwin’s idea for natural selection. Darwin noticed a lot of variation in domesticated plants and animals.Artificial selection is the process by which humans select traits through breeding.neck featherscroptail feathers
2 Hundreds to thousands of years of breeding (artificial selection) Darwin found convincing evidence for his ideas in the results of artificial selectionThe selective breeding of domesticated plants and animalsFigure 13.2AHundreds to thousands of years of breeding (artificial selection)Ancestral dog (wolf)Figure 13.2B
3 Natural selection is a mechanism by which individuals that have inherited beneficial adaptations produce more offspring on average than do other individuals.Heritability is the ability of a trait to be passed down.There is a struggle for survival due to overpopulation and limited resources.Darwin proposed that adaptations arose over many generations.
4 Natural selection explains how evolution can occur. There are four main principles to the theory of natural selection.variationoverproductionadaptationdescent with modificationADAPTATIONOVERPRODUCTIONVARIATION
5 Natural selection explains how evolution can occur. There are four main principles to the theory of natural selection.Variationoverproductionadaptationdescent with modificationFitness is the measure of survival ability and ability to produce more offspring.
6 Natural selection acts on existing variation. Natural selection can act only on traits that already exist.Structures take on new functions in addition to their original function.wrist bonefive digits
7 Your Team Members Kennidra, Anna, Felicia, Faith Makay, Cole, Alex, FarrahHaley, Marquasia, Caity, EricTameshia, Whitney, Brittany C., DhanikaBrittany P., Crystal, Teresa, NicoleEmily, Drennan, Julia
8 Your TaskFind out all components on the bottom of the cube. You can only view one side of the cube and everyone can see the top.You can get information from other teams only if they want to share information with you.You have to write a short paragraph on what your answer is and why you think it is the correct answer.
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