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hypothesis-disproved theory
life can arise form nonliving matter |
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major explosion 15 billion years ago
resulted in the formation of the universe |
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| formed 4.6 billion years ago |
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consister of the gases N2 CO2 water vapor H2 CO
O2 was not prsent in the early atmosphere |
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| cumalation changes that occur in a population over time |
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preserved remains of ancient organisms
buried in sediment in layers
leave imprints
radioactive dating |
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study of distrubution of plants and animals throught the world
physical factiors limit population range |
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| Embryological Developmetn |
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| Embryo:orgamisns at early stages of developement |
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homologous structures:similat sructures derived from descent from a common ancestor
different species
functions may differ |
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| reduced or functionless anatomicalfeatures that are fully developed in other species |
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| most organisms share certaion things common: DNA, RNA, ATP, 20 amino acids and many enzymes |
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follow the genes of living species
ex human-chimp 97.5% human-lemur 42% remote commor ancestor |
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1744-1829 French Biologist
change in the environment produces a need for a chnges in animals
acquired charactericticswould be passed on to offspring in a chnged form/not determined byu genes |
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1809-1882 British naturalist Beagle: 5 yr sailing trip around world
originof species by natural selection 1859 |
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| physical traits and behaviors that allow an organism to survive and reprodice |
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| combination of an organisns habitats and it's role in that habitat |
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| intentional breeding for a certain traits, or combinations selection |
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| the survivial and reproduction of organisms that are best suitedto thwir environment |
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mutation in the DNA,crossing over independent assortment
overproduction of offspring
struggle for existence |
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carryin capcity
compeition food, territor, water mates differental survival and reproduction surviors passon genes to next generation |
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| group of organsms with similar characteristics that reproduce and produce fertile pffspring in nature |
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| continents, islands, rivers, mountains, roads |
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| change in mating rituals, mating times |
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| how a new species evolves from an old one |
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| coevolution-2 or more closely related species change in response to each other |
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| organisms not closely related, resemble each other cuz they have responded to similar environments |
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| related to population become less similar as the respond to different enviornments |
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| Darwin-species evolve gradually(millons of yrs) stable rate |
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evolution in sharp steps
irregular rates |
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study pop. from a gentic point of view
individuals don't evlove, pops evolve |
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mutations
recombinations during meiosis crosing over/independent assortment
random fusion of gametes |
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| all of the genes for all of the traits in a population |
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| % of an allele in a gene pool |
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| change in allele frequencies in a gene pool caused by:mutation, selection, migration, inbreeding, genetic drift |
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| change in a gene pool of a population due to chance |
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