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Inherited Traits Notes Pedigree- a family history diagram that shows how a trait is inherited over several generations Males are represented by a square Females are represented by a circle Parents (mating) are represented by a horizontal line Generations (offspring) are represented by a vertical line Normal Male Affected Male Normal Female Affected Female Roman Numerals represent Generations I or VI Arabic Numbers represent individuals within a generation Inheritance of Traits Autosomal inheritance-will appear in both sexes equally Sex-linked inheritance- Most are carried on the X chromosome and are recessive. Because males have only one X chromosome, a male who carries a recessive allele on the X chromosome will exhibit the sex linked condition Examples: Red-green color blindness and hemophilia Recessive Genetic Disorder-An individual with recessive genetic disorder must have homozygous recessive alleles Examples: Sickle Cell Anemia, Tay-Sachs, Cystic Fibrosis, Albinism Dominant Genetic Disorder-Some genetic disorders are caused by dominant alleles. Those who do not have disorders are homozygous recessive Examples: Huntington’s Disease and Hypercholesterolemia
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