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PEDIGREE CHARTS A family history of a genetic condition or trait
W HAT IS A PEDIGREE CHART ? Pedigree charts show a record of the family of an individual. They can be used to study a hereditary condition or trait. They are especially useful when there are large families that cover several generations. © 2007 Paul Billiet ODWSODWS
S TUDYING HUMAN GENETICS Today genetic engineering has new tools to offer doctors studying genetic diseases A genetic counselor will still use pedigree charts to help determine the distribution of a disease in an affected family © 2007 Paul Billiet ODWSODWS
ORGANIZING A PEDIGREE CHART Generations are identified by Roman numerals & are on different levels. I II III IV
Males are represented by the square Females are represented by the circle I II III IV
Parents are connected with a horizontal line. Offspring are below the parents and the bracket is connected by a vertical line. Siblings are within the same bracket.
READING THE SYMBOLS USED IN PEDIGREE CHARTS Normal male Affected male Normal female Affected female Marriage A marriage with five children, two daughters and three sons. The eldest son is affected by the condition. Eldest child Youngest child © 2007 Paul Billiet ODWSODWS
S EX L INKED D ISORDER : C OLOR -B LINDNESS
Genetic Counselors use a pedigree chart to predict the probability of transmitting an inherited disorder. Cystic Fibrosis – autosomal recessive
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