pedigree analysis - ex: sickle cell anemia, downs syndrome, and cystic fibrosis
TRANSCRIPT
PEDIGREE ANALYSIS
PEDIGREE ANALYSIS
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• Ex: sickle cell anemia, downs syndrome, and cystic fibrosis
DRAWING A PEDIGREE • Generations are numbered
with Roman numerals (I, II, III) on the left side of the pedigree
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Key to Pedigree Symbols
Male Square
Female Circle
Marriage Horizontal line between couple
Divorce Broken horizontal line between couple
Multiple marriages Numbered horizontal line between couples
Death Diagonal slash over person’s symbol
SiblingsVertical line from parents to a bracketed horizontal line over
siblings
Fraternal twins Connected by a triangular line above
Identical twins Connected by a triangular line above and a horizontal line between
Adoption Capital “A” inside symbol
Having a trait Shaded in as specified in your key
12
or
or
A Aor
or
SAMPLE PEDIGREE
SAMPLE PEDIGREE