Gappa 7th Science Chapters 4 & 5
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| Sex-linked gene | A gene that is carried on the X or Y chromosome; these traits occur more in males than females
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| Carrier | A person who has one recessive allele for a trait and one dominant allele, but does not have the trait.
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| Pedigree | A chart or " family tree" that tracks wich members of a family have particular trait.
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| Genetic Disorder | An abnormal condition that a person inherits through genes or chromosomes.
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| Genome | All of the DNA in one cell of an organism.
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| Species | A group of similar organisms whose members can mate whith one another and produce fertile offspring.
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| Natural Selection | The process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species.
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| Adapation | A characteristic that helps an organism survive in its environment or reproduce.
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| Relative Dating | A technique used to determine which of two fossils is older.
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| Absolute Dating | A technique used to determine the actual age of a fossil.
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| variation | any differences (good or bad) among members of the same species
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| Female Sex Chromosomes | XX
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| Male Sex Chromosomes | XY
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| mold | a fossil formed when an organism buried in sediment dissolves, leaving a hollow area
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| cast | a fossil that is a copy of an organism’s shape, formed when mineral seep into a mold
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