pedigree
DESCRIPTION
Pedigree. Pedigree. “genetic” family tree. Male. Pedigree Symbols. Female. Pedigree Symbols. Mating between individuals. Pedigree Symbols. Mating between close relatives. Pedigree Symbols. Offspring “ line ”. Pedigree Symbols. Label generations (Roman Numerals ). Pedigree Symbols. - PowerPoint PPT PresentationTRANSCRIPT
Drawing a pedigree
Draw a pedigree that shows three children (one older brother and two younger sisters). The mother is older than the father. The mother’s father is older but the father’s mother is older. The eldest daughter, the father’s father (grandfather), and the mother are afflicted with a recessive disorder.
Interpreting Pedigrees
Autosomal•“Equal” number
of afflictedmen and women
Sex-linked•One sex is
afflicted morethan the other
Dominant•Does not skipa generation•No carriers
Recessive• Can Skip Generations
•Women and mencarriers
Dominant•No carriers
•More femalesafflicted than
males
Recessive•Only women
Carriers•More males afflicted
than females•Afflicted women must have afflicted
fathers