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ABC news – video clip Human thehappyhospitalist.blogspot.com/2008_10_01_a... Genetic Traits ? http://www.telegraph.co.uk/news/worldnews/asia/indonesia/tree-man/ Dominant and Recessive Traits Dominant traits are seen in the phenotype for both Heterozygous (Tt) and Homozygous (TT) genotypes. Dominant Examples: • Tongue-roller • Freckles • High blood pressure • Dwarfism • Six fingers • Baldness (males) • Dimples Recessive traits are seen in the phenotype ONLY When a person has a Homozygous (tt) genotype. Genetic Diseases Dominant (TT or Tt) • Huntington’s Recessive (tt) • Tay-Sachs • PKU • Cystic Fibrosis • Sickle-cell Anemia Sex-Linked Recessive (XrY) or (Xr Xr) • Hemophilia • Color blindness Other Inherited Diseases Down Syndrome (3 copies of chromosome 21) Nondisjunction Examples of Diseases which are NOT Inherited Cancer • Some cancers are due MOSTLY to environmental exposure • Some cancers have a genetic risk factor Infectious Diseases • Chickenpox • Flu • Strep throat • Food poisoning Diet • Some diseases are caused by a lack of nutrients like vitamin C