Sex Do you have freckles or dimples? Can you roll your tongue? Do you have a high risk for a heart attack? Are you more likely than others to get Alzheimers? Do you metabolize alcophol more slowly than your friends? Genes: Specific locations on Chromosomes that produce particular hereditary traits Locus: Particular site on chromosome where a gene is found. Homologous chromosomes have corresponding gene loci. Do you want to know your DNA? X-linked traits? BRCA Gene Does someone already know your DNA? Law: State law requires newborn genetic screening for PKU Recent blood test? Recent surgery? The Future? Choose certain genes for your children?