Dihybrid Crosses & PedigreesATI TEAS 7 cheat sheet

Two traits, and family trees

9 key facts Reviewed Oct 2026

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Dihybrid

Tracks two traits at once
A 4×4 Punnett square, 16 boxes
Classic ratio 9:3:3:1

Pedigree Symbols

Square male · circle female
Shaded affected · half-shaded carrier
A horizontal line joins mates; vertical lines show children

Reading It

Two unaffected parents with an affected child → the trait is recessive
An affected child in every generation suggests dominant

Sex-Linked Clue

Mostly males affected points to X-linked recessive

Key takeaway

Two traits, and family trees

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