Pea Plant Punnett Square

Mendel's Pea Traits

Color:

• Y = Yellow (dominant)
• y = Green (recessive)
• YY or Yy → Yellow peas
• yy → Green peas

Shape:

• R = Round (dominant)
• r = Wrinkled (recessive)
• RR or Rr → Round peas
• rr → Wrinkled peas

Classic F2 Cross

Mendel's famous dihybrid cross used heterozygous parents:

YyRr × YyRr

This produces the classic 9:3:3:1 phenotype ratio:

• 9 Yellow Round
• 3 Yellow Wrinkled
• 3 Green Round
• 1 Green Wrinkled

Click "Load Example" to see this cross!

About This Tool

This Punnett square demonstrates Mendel's laws of inheritance using his pea plant experiments.

Select genotypes for two traits (color and shape) to see all possible offspring combinations and their phenotype ratios.

The visual representation shows:

• Yellow or Green pea color
• Round or Wrinkled pea shape

Blood Type Calculator

Calculate possible blood types for offspring based on parent blood types and Rh factors.

Features:

• ABO blood type genetics
• Rh factor inheritance
• Visual blood type icons
• Probability percentages
• 4×4 Punnett square

Try Blood Type Calculator →

Hardy-Weinberg Calculator

Calculate allele and genotype frequencies in populations at genetic equilibrium.

Features:

• Population genetics analysis
• Allele frequency calculations
• Genotype distribution
• Equilibrium testing
• Educational explanations

Try Hardy-Weinberg →

Chi-Square Test

Test whether observed genetic ratios fit expected Mendelian ratios statistically.

Features:

• Statistical hypothesis testing
• Expected vs observed ratios
• P-value calculation
• Degrees of freedom
• Significance interpretation

Try Chi-Square Test →