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Pedigree

Pedigree. Used to show how a particular trait is passed from one generation to the next in a family. Allelic Disorders - genetic disorders are USUALLY recessive. Albinism. Many forms, many genes code for it Lack of pigment in skin, hair, and eyes. Approx. 1 in 17,000 people

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Pedigree

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  1. Pedigree Used to show how a particular trait is passed from one generation to the next in a family

  2. Allelic Disorders -genetic disorders are USUALLY recessive

  3. Albinism • Many forms, many genes code for it • Lack of pigment in skin, hair, and eyes. • Approx. 1 in 17,000 people • Health Impacts • Eye problems • Severe sensitivity to sunburn.

  4. Cystic Fibrosis • Gene mutation on chromosome 7 • Health: build up of mucus in the lungs, pneumonia • One of the first disorders to be actively studied for gene therapy.

  5. Sickle Cell Anemia • Codominant disorder found in African Americans. • Red blood cells are mishapen. • Characterized by extreme pain in legs and arms because the cells get stuck in capillaries. normal rbc sickle-cell rbc

  6. Tay-Sachs Fatal genetic disorder from a buildup of fatty substances in tissues and nerve cells in brain. Infants develop normally then deteriorate to become blind, deaf, unable to swallow leading to muscle atrophy and paralysis. Persons with Tay-Sachs also have "cherry-red" spots in their eyes. Both parents must carry the mutated gene in order to have an affected child.

  7. Huntington’s Disease • Results in a loss of muscle control and mental function. The symptoms usually do not appear until after 30 years old. • Approximately 1 in 10,000 births • Gene on chromosome 4

  8. Huntington’s Disease

  9. Color Blindness • Recessive gene located on the X chromosome. • Sex-Linked disorder • Cannot distinguish red/green • Does color blindness affect more men or women? MEN • Why? Men only have one X chromosome, thus only one copy of the color blind gene.

  10. Hemophilia • A disorder in which a person’s blood does not clot properly. • Gene found on X chromosome. • 1 in 10,000 males born are afflicted.

  11. Pedigree Chart and Symbols

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