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20 Cards in this Set
- Front
- Back
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DNA
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is the chemical compound that codes all life and is found in the chromosomes of each cell
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Genotype
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is the two-letter code for a specific trait. (ex. Gg or GG or gg)
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Phenotype
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the pyshical appearance of a specific trait. Its what you see, brown hair or blonde hair.
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Theory of evolution
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states that all living things change over time.
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Mutations
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Random genetic changes in an organism.
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Fossils, biological & genetic evidence
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is used to show common ancestry between animals from the past & present.
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Geologic time scale
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used by scientist to help compare pesent & past life forms.
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Thoery of natural selection
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states that organisms with traits that are not suited for their enivoronment usually die before reproducing so their traits are not passed on.
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Variation
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Caused by new gene combinations within the same population, for example brown fur or white fur.
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Reproductively successful
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orgamism have the traits needed to survive in their enivornment.
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Mutually beneficial
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The type of symbiosis where both ogranisms help in the relationship.
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Food webs
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show many feeding relationships between organisms within the same ecosystems.
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Population
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A group of the same kind of living things in the same area.
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Community
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Many populations in the same area.
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Biodiversity
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the number and variety of living things within an ecosystem.
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Natural Balance
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occurs when all organisms in a food web have enough resources for their population to survive.
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Non-native species
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Organisms in an area that they were not originally from.
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Invasive species
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Non-native species that upset the balance within an ecosystem b/c they compete w/ native species & have no natural predators.
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Succession
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gradual, predictable change that happens to an ecosystem.
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Climax community
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The last stage of succession.
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