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| Three or more forms of a gene that code for a single trait. |
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| A gene that is carried on the X or Y chromosome. |
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| A person who has one recessive allele for a trait and one dominant allele, but does not have the trait. |
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| A chart or “family tree” that tracks which members of a family have a particular trait. |
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| An abnormal condition that a person inherits through genes or chromosomes |
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| A technique by which a small amount of the fluid that surrounds a developing baby is removed; the fluid is analyzed to determine whether the baby will have a genetic disorder. |
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| A picture of all the chromosomes in a cell arranged in pairs. |
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| The process of selecting a few organisms with desired traits to serve as parents of the next generation. |
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| A selective breeding method in which two individuals with identical or similar sets of alleles are crossed. |
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| A selective breeding method in which two genetically different individuals are crossed. |
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| An organism that is genetically identical to the organism from which it was produced. |
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| The transfer of a gene from the DNA of one organism into another organism, in order to produce an organism with desired traits. |
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| The insertion of working copies of a gene into the cells of a person with a genetic disorder in an attempt to correct the disorder. |
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| All of the DNA in one cell of an organism. |
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