Punctuated Equilibrium - A mode of evolution characterized by relatively short bursts of rapid evolutionary change interspersed with long periods of little change., Gradualism - The theory that species evolve slowly and gradually over extended periods of time., Anatomical Homologies - Similarities in structures among species that exist because of descent from a common ancestor., Fossil Record - The fossils and their locations in the sedimentary layers of Earth's crust that provide information about things that lived in the distant past., Ancestry - The lineage of successive parents and offspring that leads to an organism or species., Homology - Two characteristics that are similar because they originated from a common ancestor., Stasis - Describes a long period of time in which little or no change occurs within a species., Molecular Homologies - Similarities in DNA, RNA, or proteins between organisms that result from common ancestry., Biogeography - Study of past and present geographical distribution of species., Speciation - The divergence of multiple populations or subpopulations of the same species to the point where they can no longer interbreed to generate fertile offspring., Developmental Homologies - Similarities in the ways that organisms grow from zygotes to adults that exist because the organisms share a common ancestor., Evolution - Descent with modification., Recombination - The process by which new combinations of alleles that are not found in the parents are produced in offspring., Overpopulation - More organisms in an area than an ecosystem can support., Natural Selection - A mechanism of evolution; the process that results in the survival or reproductive fitness of an individual or group that is best adapted to its environment., Immigration - The movement of organisms into an area., Genetic Drift - The change in the frequency of an allele in a population due to the random chance survival of certain organisms within the population., Adaptation - An alteration in an organism's characteristics that better enables it to survive in its environment., Population - All of the organisms of one species within a particular ecosystem., Founder Effect - The chance fixation of alleles in a population due to those alleles being possessed by a small number of individuals from which the entire population descends., Reproductive Success - An organism's ability to pass on its genes., Biological Fitness - An organism's or population's ability to reproduce based on the available resources., Mutation - A change in the DNA sequence of a chromosome., Emigration - Leaving one's country or region for another., Genetic Variation - The variety of gene populations that exist within a population., Limiting Factor - An environmental factor that limits the growth of a population., Biodiversity - The total variation of species within a given ecosystem., Bottleneck Effect - A reduction in the size of a population to a single or few individuals, resulting in the loss of genetic variation., Dichotomous Key - Tool used to classify an organisms through questions with only two possible answers., Heterotrophic - Organisms that consume other organisms for energy., Cladistics - Classification based on shared characteristics between groups and their common ancestors., Autotrophic - Organisms that obtain energy from an abiotic source like sunlight or inorganic chemicals., Asexual Reproduction - Method of reproduction that requires only one parents and produces identical offspring., Binomial Nomenclature - The system of naming organisms scientifically., Cladogram - A branching diagram showing the descent of organisms from a common ancestor., Multicellular - Organisms composed of more than one cell., Phylogeny - The evolutionary development of a species., Unicellular - Organisms composed of a single cell., Eukaryotic Cell - Contains a nucleus and membrane bound organelles., Species - A group of organisms that can interbreed to produce fertile offspring., Kingdom - The highest level of taxonomic classification beneath that of the three domains., Prokaryotic Cell - Lacks a nucleus., Sexual Reproduction - The reproductive process involving two parents whose genetic material is combined.,

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