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22 Cards in this Set
- Front
- Back
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evolution
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transforced life over time
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adaptation
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inherited characteristics that improves an organism's ability to survive adn reproduce in a particular enviroment
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descent with modification
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descendants of ancestral organisms=> accumulate adaptations to divers ways on life in certain habitats
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natural selection
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process in which indiciduals with inherited characteristics well-suited to the envirmoment leace more offspring ov average taht do other individuals.
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fossils
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perserved remains or marking left by organismsd that lived in the past (sediments)
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fossil record
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chronological collection of remains in rock layer
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extinct
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species tha tno longer exist
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homologous structures
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structures in species sharing a common ancestor (structures are the same but used for differnt functions)
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vestigial structure
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remnants of structures that may have important functions in an ancestral species but have no clear functions in modern descendants (goosebumbs-insulate furn and raise hair)
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placental animal
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deer and squirrels, mammals whose young complete the embryonic development before birth
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molecular Biology
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DNA sequences determine amino acid squences info riched molecules tat records organisms ancestry
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population
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group of indiciduals=>same species=> same area=>same time
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variation
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differences among members of same species=> exist across all species (inheritable)
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artificial selection
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selective breeding of domesticated plants and animals to produce offspring with genetic traist valued by humans
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gene pool
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consists of all the alleles in all the individuals that make up a population
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Darwins theory of natural selection
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population of organism- overprudction=>sturggle for existence=> differences in reproductive success=> evolution of adaptations OR-variations=> differences in reproductive success=> evolution of adaptations
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microecolution
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evolution on the smallest scle- a genreation-to-generation change in the grequencies of allels within a population
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Hardy-Weinberg equilibrium
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condition that occurs when the frequency of lalels in a particulargene pool remains constantover time
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genetic drift
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a change in the gene pool of a population due to chance
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gene flow
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the exchange of genes with another population is referred to as gene flow
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biological definition of fitness
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the contribution that an individual makes to the gene pool of the next generation compared to the contributions of other indiciduals.
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antibiotics
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medicines that kill or slow the growth of bacteria
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