Sci 9 Biological Diveristy Topic 4

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Continuous Variation

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Traits that show a range of possibilities, often influenced by multiple genes and environmental factors, such as height or skin color.

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Discrete Variation

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Inherited traits that have a limited number of variations, such as the ability or inability to roll one’s tongue.

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Dominant

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A trait that is expressed in the offspring even if only one parent contributes the gene for that trait.

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Recessive

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A trait that is expressed in offspring only if both parents contribute the gene for that trait; it does not show up if a dominant gene is also present.

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Mutations

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Changes in the genetic information (DNA) of an organism, which can result in new traits or changes in existing traits.

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Mutagens

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Agents that can cause changes or mutations in the genetic material of an organism.