Bio2 Lecture 25

Bio2 Lecture 25 - Bio2 Lecture 25 Practice Exam Questions...

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Bio2 Lecture 25 4/21/05 Practice Exam Questions If evolution can be defined as changes in gene or allele frequencies, then the ultimate form of evolution change is a. extinction The concept that evolutionary change is not slow and a gradual but rather occurs in comparatively brief bursts, separated by longer stable intervals with littler or no evolutionary change, is known as a. punctuated equilibrium An example of pre-adaptation: a. dinosaur scales becoming feathers Reproductive isolation In case of mules with odd chromosomes is the two pair of chromosomes cant pair up How do new species arise from existing species? Speciation! Allopatric speciation – separation results in interruption of gene flow Sympatric speciation – speciation occurring in same habitat and results in interruptoion of gene flow, for pup fish elements that affected it are genetic drift, reproductive isolation, population that are evolutionary independent because they cant interbreed, mutations that cannot make it into another pool Tremendous amount of speciation as in mammals and Darwin’s Finches is adaptive radiation 80% of some plants are polyploids The middle fossil in 3 fossils that are evolving is a transitional fossil, these are why most fossils are discontinuous Extinction 439 234 253 MYA 213 MYA 65 MYA Evolution just a theory? Tremendous misunderstanding of what a theory is, its not a hypothesis, in biology this is as high as you can go, helps us build a framework by which we can build predictions in Population Ecology - Dispersion - Changes in population size: population models
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- Population regulating mechanisms - Reproductive strategies r& k selection - Survivorship Curves Ecology – recommended reading Population ecology – ch51 Community ecology – ch52 Population – interbreeding individuals in one place at one time Dispersion - the way the individuals in this population are aggregated - Static – no change o Clumped (patchy) – the bio room is clumped because there are more people in front row than back row, usually clumped around resource (screen), reflects resources, female gorillas form bands and are clumped, squirrels are clumped around oak forest o Uniform – less about distribution of resources but a mutual repulsion of animals in that population, like a male and his territory, and black walnuts, which produce a chemical that inhibits plant growth from around it o Random – also about resources, in this case, resources are random, so population resources are random, this is rare because resources are not distributed randomly, example would be a bag of flour, and flour beetles inside would be random - Dynamic – populations that change o Change in a population over time, population ecology in the change in population density Changes in population size - Populations possess enormous potential for growth
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This note was uploaded on 08/10/2009 for the course BIO 102 taught by Professor Brey during the Spring '08 term at Rutgers.

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Bio2 Lecture 25 - Bio2 Lecture 25 Practice Exam Questions...

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