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Powerpoint Presentation: Pedigree Charts

 

Genetics Index

Chromosomes
Meiosis
Meiosis: Crossing over
Mitosis and Meiosis
Introduction to Mendelian Genetics
Test Cross
Codominance
Multiple Alleles
Twin Studies
The dihybrid cross
Dihybrid Cross : Test Cross
Autosomal Linkage
The Genetic Diagram for Linked Genes
Calculating the cross over value using a test cross
Sex determination and sex linkage
Sex linkage
Genetic diagram for sex linked genes
Blood Clotting and Haemophilia
The Retina and Daltonism
Genetic Modification
Cloning Animals
Cloning Plants

Topic Chapters Index

 

GENETICS

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Pedigree Charts

A pedigree chart shows a record of the family of an individual. It can be used to study the transmission of a hereditary condition. It is particularly useful when there are large families and a good family record over several generations.

You cannot make humans of different types breed together so pedigree charts provide one of the few ethical ways of studying human genetics. Today genetic engineering has new tools to offer doctors studying genetic diseases but a genetic counsellor will still use pedigree charts to help determine the distribution of a disease in an affected family.

 

Symbols used in pedigree charts

pedigree charts

 

Organising the pedigree chart

Below is a pedigree chart of a family showing four generations. A total of 20 individuals.

Below is a pedigree chart of a family showing four generations. A total of 20 individuals.

Generations are identified by Roman numerals. Individuals in each generation are identified by Arabic numerals numbered from the left. Therefore the affected individuals are II3, IV2 and IV3.

 

pedigree chart

 

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