This is a ppt for pedigree

1. PEDIGREE DRAWING
ANAMUL HAQUE
JUNIOR OPTOMETRIST, IIEI&H, DHAKA-1215
The largest & oldest multispecialty eye hospital

2. WHAT IS A PEDIGREE CHART
A pedigree chart is a diagram that shows the occurrence and appearance of phenotypes of a
particular gene or organism and its ancestors from one generation to the next. It is also called
family tree.

3. Importance of Pedigree Chart
A pedigree provides a graphic depiction of a family's structure and medical history. It is
important when taking a pedigree to be systematic and use standard symbols and
configurations. A pedigree helps to identify patients and families who have an increased risk for
genetic disorders.
By analyzing a pedigree, we can determine genotypes, identify phenotypes, and predict how a
trait will be passed on in the future. The information from a pedigree makes it possible to
determine how certain alleles are inherited: whether they are dominant, recessive, autosomal,
or sex-linked.

4. How to Draw Pedigree
 Males are represented as squares, while females are represented as circles.
 Shaded symbols mean an individual is affected by a condition, while an unshaded symbol
means they are unaffected.
 A horizontal line between man and woman represents mating and resulting children are
shown as offshoots to this line.
 Generations are labeled with roman numerals and individuals are numbered according to age
(oldest on the left).

5. Symbols and Drawing of Pedigree
Male family member is represented by a square
Female family member is represented by a circle
Gender not specified

6. Symbols and Drawing of Pedigree
Shaded circles or squares represents affected individuals
Affected fetus
Representation of 2 or more conditions

7. Symbols and Drawing of Pedigree
Individual seeking medical attention
Affected individual seeking medical attention

8. Symbols and Drawing of Pedigree
Normal relation between couple is demonstrated by straight line
Consanguineous mating is demonstrated by two Parallel lines
Divorced Relationship between couple is demonstrated by
broken line between the couple

9. Symbols and Drawing of Pedigree
Adopted child
Couple not having baby
Biological parents unknown
?

10. Symbols and Drawing of Pedigree
Twins
Identical Non-identical

11. Symbols and Drawing of Pedigree
Monozygotic
Dizygotic
Unknown zygocity
?

12. Symbols and Drawing of Pedigree
X-linked – Carrier are depicted Central dot in a circle
Autosomal carrier Represented by central vertical line
Deceased/Death sib is represented with slash
.

14. Example Pedigree of an Albinism Patient

15. 3 Generation Pedigree Example

16. Documentation

17. Documentation