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| Fertilization of the female gamete by the male gamete results in the formation of a zygote |
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| A segment of DNA that provides the specific biochemical instructions cells need to perform particular functions in the body. Some remain unexpressed. |
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| Everybody has 23 pairs (one pair from each parent), each comprising hundreds of genes. The 23rd pair determines sex (XY in males and XX in females). |
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| The remaining 22 pairs of chromosomes that are not the sex chromosomes |
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| Cellular duplication and division, beginning shortly after conception and continues throughout the development of an individual. |
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| Fraternal twins develop from two separate zygotes. |
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| The sum total of all the genes a person inherits. A person who has a particular gene as part of his or her genotype is called a carrier of that gene. |
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| The part of a person's appearance and behavior that expresses his or her genetic inheritance |
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