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Transcript
Pedigrees Pedigrees are used to: – Determine whether a trait is inherited – Show how a trait is passed from one generation to the next – To determine if an allele is dominant or recessive Symbols: • Female • Male Connecting Symbols: • Married Couple • Siblings Generations I II III Symbols: • Affected • Carrier • Deceased Sex-linked: Sex-linked issues… • Are caused by genes located on X or Y chromosome • More common in males since they have only 1 X chromosome; females more often carriers • Female must have 2 recessive genes for trait to occur Karyotypes • To look for nondisjunction (chromosomes fail to separate) or other genetic disorders Karyotypes • To look for nondisjunction (chromosomes fail to separate) or other genetic disorders Accessing Genetic Disorders • Analyzing pedigrees • Genetic counseling • Prenatal testing
