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Bio 282: week 3 notes

by: Fatima Barat

Bio 282: week 3 notes BIO 282

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Fatima Barat

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This is this weeks notes we have covered.
ConceptualApproachBioMajors II
Class Notes
Biology 282
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This 1 page Class Notes was uploaded by Fatima Barat on Friday January 22, 2016. The Class Notes belongs to BIO 282 at Arizona State University taught by Wright in Fall 2015. Since its upload, it has received 93 views. For similar materials see ConceptualApproachBioMajors II in Biology at Arizona State University.


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Date Created: 01/22/16
Week 3 notes Bio 282 v How to get the most out of life? Ø A bag of chips is like a heard of gazelle § In a patch § They are energy and space Ø Assumption 1: Feeding depletes food in a patch § A new bag of chips gives more energy § The amount of time spent getting the chips is that that much amount of calories we are obtaining § Small bag of chips and crumbs results in getting less for the same amount in a full bag of chips § Feeding in a patch always depletes the energy in that patch § Optimal strategy: maximizes the net benefit § Net benefit=benefit-cost Ø Assumption 2: traveling between patches takes time § Potential cost is spending time to find the chips, when you could have eaten the crumbs § Time vs energy gained graph • It starts with a high energy then decreases over time • Slope of a line is total energy gained over time • In order to obtain optimal maximum level, a tangent line can be drawn which includes average time taken to eat the chips and to go searching for it • A shallow slop means getting less energy • If the time taken to get the chips is below or above the total optimal then the slope is still shallow, and it is only when it is at the optimal max that one a get the most energy v How organisms use energy to grow and reproduce Ø Life history: genetically predisposed characteristics strategies that makes an organism § Life characteristics in each generation is linked to fitness, growth, and reproduction • Ex. Size at birth § Genetic factors determine how one uses energy and not all is used toward growth • If all energy is consumed to growth rather than reproduction, then it has lower fitness and there needs be a balance in order to maintain both § Advantages of reproducing early is having a lot of offspring to continue with generation • As a result, Natural selection is favoring them because of the balance of reproducing and caring for the offspring at once • Growth and reproduction is controlled by genes so strategies in the passed can work for the present generation and after that


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