Free Pedigree Chart Maker

Choose Blank. Select the female proband, name her Learner C, set Affected and type aa as her genotype annotation. Use Parents to add a male and female parent. Name them Parent A and Parent B, leave both Unaffected and type Aa under each. Select Learner C again, add a Sibling and set that person to male, Unaffected, named Learner D, with no genotype annotation.

Check the family: I-1 is Parent A, I-2 is Parent B, II-1 is Learner C and II-2 is Learner D. Set the title to Fictional Trait Worksheet, the subtitle to Illustrative family; simplified single-gene exercise, and the affected key label to Trait T. These names and data are fictional.

The panel reports autosomal recessive possible, with both parents required to be carriers. The other four models are ruled out under the stated assumptions. The unaffected parents and affected daughter are the relevant recorded inputs; the Aa and aa text only illustrates the compatible recessive explanation. Changing aa to AA would not change the analysis, so check annotations yourself.

For the teaching version, choose Textbook and Slide, keep generation numbers, genotypes and the key visible, and enable Show on the chart in the inheritance panel. Download the 1280×720 PNG. For a worksheet, choose Page and disable Show on the chart to export the 816×1056 version without the explanation panel. Turn off Genotypes as well if students should infer them. Preview zoom does not change either download size.

Sex determines the square, circle or diamond; status determines the fill. Names and genotype annotations appear beside the symbols, and the key explains the marks in use. Select a person to change deceased, proband, consultand, adoption or twin properties. Select a partner line to mark the partners as related. Review these details against the exercise rather than assuming the analysis verifies your labels.

Add relatives from the selected-person controls. The current tool permits up to two partners per person. IDs and generation positions update as the family changes. A starter replaces the family and header/key text; Undo restores those content changes. Presentation choices such as theme, carrier style, visibility, size and zoom have separate controls and are outside Undo history.

Use the panel to test consistency with five simplified models, not to choose the most likely real-world explanation. Under its complete-penetrance, no-new-mutations assumptions, an autosomal-dominant explanation requires an affected child to have an affected genetic parent. A recessive explanation can fit unaffected carrier parents with an affected child. These conditional checks are more useful than treating every-generation or skipped-generation patterns as universal rules.

A required-carrier list states what must be true for a recessive model to fit; it is not a probability calculation. Real conditions may involve new variants, incomplete penetrance, other inheritance patterns or multiple genes and environmental influences. The panel does not cover all of these. Use fictional or textbook cases for learning, and do not treat its result as a clinical diagnosis.

A family tree records ancestry: use the family tree maker when descent is the main question. A genogram records broader family relationships and conditions: use the genogram maker for that task. This pedigree page focuses on one trait and a conditional inheritance exercise.

To explore offspring combinations for specified parental genotypes, use the punnett square maker. Keep those cross assumptions separate from the genotype annotations on this pedigree; typing labels here does not run a Punnett square or establish the probability of an inheritance model.