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 | Definition 
 
        | Rod-shaped structures that are composed of genes and found within the nuclei of cells. |  | 
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 | Definition 
 
        | Splits lengthwise to double in number. Half of each chromosome combines to retake original form. 46 chromosomes. |  | 
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        | Term 
 | Definition 
 
        | Each pair of chromosomes splits and one member of each pair moves to the new cell. 23 chromosomes. |  | 
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 | Definition 
 
        | Member of a pair of chromosomes. |  | 
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        | Term 
 | Definition 
 
        | Stem from the interaction of heredity and environmental factors. |  | 
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        | Term 
 | Definition 
 
        | Chromosomal abnormality. Intellectual disability and caused by an extra chromosome in the 21st pair. |  | 
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        | Term 
 | Definition 
 
        | Fatal genetic disorder where mucus obstructs the lungs and pancreas. |  | 
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        | Term 
 | Definition 
 
        | Genetic form, or construction of a person as determined by heredity. Traits inherited from our parents. (Genes) |  | 
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        | Term 
 | Definition 
 
        | Actual form or constitution of a person as determined by heredity and environmental factors. Our actual traits. (What we look like) |  | 
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        | Term 
 | Definition 
 
        | Developmental disorder characterized by failure to relate to others, communication problems, intolerance of change, and ritualistic behavior. |  | 
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        | Term 
 | Definition 
 
        | Injection of sperm into the uterus to fertilize an ovum. |  | 
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        | Term 
 | Definition 
 
        | Fertilization of an ovum in a laboratory dish. |  | 
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