Pedigree Chart vs Genogram: What's the Difference?
Pedigrees and genograms look alike but answer different questions. Compare their notation, audience, and purpose — and when to use which.
- basics
- comparison
- family-history
Both are structured family diagrams. Both use squares, circles, and lines. So why do they have different names?
The same skeleton, different questions
A pedigree chart is a genetics instrument. Its purpose is to trace a trait — a disease, a carrier status, a mode of inheritance — through a family. Its notation is standardized and compact: sex, affected/carrier, deceased, proband, twins, adoption. Everything else is left out on purpose.
A genogram is a social-work and therapy instrument. It maps family relationships and events over multiple generations: marriage and divorce, conflict and closeness, emotional bonds, alcoholism, abuse, migration. Its notation includes dashed and wavy lines for relationships and a wider cast of symbols.
A quick comparison
| Pedigree | Genogram | |
|---|---|---|
| Main audience | Genetics educators, counselors, researchers | Social workers, therapists, family therapists |
| Core question | What’s the inheritance pattern? | What’s the family structure and history? |
| People marks | Sex, affected, carrier, deceased, proband | Sex, plus relationship quality marks |
| Relationships | Union, consanguineous, former, twins, adoption | Marriages, separations, emotional bonds (solid/dashed/wavy) |
| Output | Print-ready chart for teaching or record | Discussion aid in sessions |
Which should you use?
Ask what decision the chart will support.
- Studying a condition in a family or a classroom — pedigree. Its symbols match what genetics literature and textbooks expect.
- Family counseling, therapy, or social assessment — genogram. You need the relationship-quality dimension a pedigree deliberately omits.
- Recording your own family health history — pedigree, ideally built from a reliable three-generation approach.
A family tree is a third thing
Plain family trees, the kind with framed photos and branches, add names and dates but usually drop trait information entirely. If your goal is health history, a pedigree is the version that carries the information forward.
The pedigree half of this comparison is exactly what the maker draws — standard notation, no manual symbol work, print-ready exports. Genograms remain a specialized tool for specialized settings.