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| flow-chart that passes throught generations of a family. A particular genetic disorder can be followed |
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| if you have a defective gene and a normal gene the defect does not show up. The person is a Carrier |
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DOMINANT GENE
Recessive Gene |
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Capital letters represent a dominant gene Lower case leters represent a recessive gene (less able to show up if alone) |
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| if you have a dominant normal gene and a recessive defective gene, the defective gene is hidden and the person is a carrier. (it takes only one dominant gene to be normal) |
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| two dominant genes DD or two recessive genes dd (pure) |
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| one dominant and one recessive gene Dd |
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- Sex chromosomes are either the X or Y chromosomes. - Each cell has TWO chromosomes. - Female has XX - Male has XY. - Traits on the X or Y chromosome are said to be sex linked. |
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| Each human cell has 44 autosomal chromosomes and 2 sex chromosomes totaling 46 |
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| come from defective genes |
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| Each trait you have comes from a matched set of genes, you have genes from your mom and dad. (brown eyes from your mom and blue eyes from your dad) |
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| based on multiple sets of genes. examples of plygenic traits are sking pigmentation, height and hand size. |
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| staudy of finger, palm, foot or skin ridge patterns. |
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Straight Thumb ======= ss: hitch hiker thumb |
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One tendon, missing muscle ========= tt 2 tendons has muscle |
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mid digital hair ========== hh: lack of mid digital hair |
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Taste PTC ================ tt: non taster of PTC |
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sticky/wet wax ========== ww: dry wax |
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