PUNNETT SQUARE
MENDEL · 3 : 1 RATIO
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Tall × Tall = ?
Tt × Tt
T
t
T
t
TT
tall
Tt
tall
Tt
tall
tt
dwarf
3 : 1
tall : dwarf
1 : 2 : 1
TT : Tt : tt
3 : 1
phenotype
1 : 2 : 1
genotype
T
dominant (tall)
1. Mendel's Cross
Tall (Tt) × Tall (Tt)
Each parent gives one gene
2. Dominant / Recessive
T (tall) hides t (dwarf)
Dwarf only if tt
3. Remember
Gregor Mendel: father of
genetics (pea plants)
MATRIC BIOLOGY · INHERITANCE · PUNJAB BOARDS
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