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Chapter 10 - compared to another individual b Examples i...

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Chapter 10 1) Natural Selection: selects among various individuals (unequal selection process); those individuals that have the “right” combination of alleles in a particular environment toend to survive and reproduce. a) Based on: i) Variation among individuals in a species (genetic proof), mutations are the source of all new alleles ii) Inheritance: adaptive alleles are passed onto offspring iii) More offspring are born than actually survive—completion for survival (food, habitat) iv) Evolutionary “fitness”= reproductive success (surviving, breeding offspring) v) Adaptation: a trait (physical or behavioral) that allows an individual to survive better
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Unformatted text preview: compared to another individual b) Examples i) Pesticide/ Antibiotic resistance ii) Artificial selection: man’s use of a selection process (i.e.: develop specific breeds of dogs or other species) c) Outcomes i) Directional selection: selection favors one extreme; usually occurs when the environment is changed ii) Stabilizing selection: 2 opposing selection pressures that result in favoring the average type rather than the extremes (bell-shaped graph) iii) Diversifying selection: favors 2 extremes, works against average type...
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