3.19: Understand How to Interpret Family Pedigrees

FAMILY PEDIGREES: Diagram that Shows How a Genetic Characteristic or a Genetic Condition is Passed on Through Generations of a Family

• Different Symbols are Used to Represent Males and Females

• Different Symbols are Used to Represent Affected and Unaffected Individuals

EXAMPLE: HUNTINGTON’S DISEASE

 

DESCRIPTION	NUMBER OF PEOPLE WHO FIT THE DESCRIPTION
MALE	7
FEMALE WITH HUNTINGTON’S DISEASE	2
HOMOZYGOUS RECESSIVE	11
HETEROZYGOUS	4
HOMOZYGOUS DOMINANT	0