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22 Cards in this Set

  • Front
  • Back
transforced life over time
inherited characteristics that improves an organism's ability to survive adn reproduce in a particular enviroment
descent with modification
descendants of ancestral organisms=> accumulate adaptations to divers ways on life in certain habitats
natural selection
process in which indiciduals with inherited characteristics well-suited to the envirmoment leace more offspring ov average taht do other individuals.
perserved remains or marking left by organismsd that lived in the past (sediments)
fossil record
chronological collection of remains in rock layer
species tha tno longer exist
homologous structures
structures in species sharing a common ancestor (structures are the same but used for differnt functions)
vestigial structure
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)
placental animal
deer and squirrels, mammals whose young complete the embryonic development before birth
molecular Biology
DNA sequences determine amino acid squences info riched molecules tat records organisms ancestry
group of indiciduals=>same species=> same area=>same time
differences among members of same species=> exist across all species (inheritable)
artificial selection
selective breeding of domesticated plants and animals to produce offspring with genetic traist valued by humans
gene pool
consists of all the alleles in all the individuals that make up a population
Darwins theory of natural selection
population of organism- overprudction=>sturggle for existence=> differences in reproductive success=> evolution of adaptations OR-variations=> differences in reproductive success=> evolution of adaptations
evolution on the smallest scle- a genreation-to-generation change in the grequencies of allels within a population
Hardy-Weinberg equilibrium
condition that occurs when the frequency of lalels in a particulargene pool remains constantover time
genetic drift
a change in the gene pool of a population due to chance
gene flow
the exchange of genes with another population is referred to as gene flow
biological definition of fitness
the contribution that an individual makes to the gene pool of the next generation compared to the contributions of other indiciduals.
medicines that kill or slow the growth of bacteria