Eye Color Calculator

Eye Color Genetics

Dominance Hierarchy:

• B (Brown) - Most dominant allele
• H (Hazel) - Dominant over G, A, g, b
• G (Green) - Dominant over A, g, b
• A (Amber) - Dominant over g, b
• g (Gray) - Dominant over b only
• b (Blue) - Most recessive allele

The most dominant allele present determines observable eye color.

Common Eye Color Patterns

Brown × Blue:

• BB × bb = 100% brown (all Bb carriers)
• Bb × bb = 50% brown, 50% blue
• Bb × Bb = 75% brown, 25% blue

Green × Blue:

• GG × bb = 100% green (all Gb)
• Gb × bb = 50% green, 50% blue

Carriers & Hidden Alleles

Two brown-eyed parents (both Bb) can have blue-eyed children (bb). This happens because they both carry the recessive blue allele.

Carrier Examples:

• Bb - Brown eyes, carries blue
• Bg - Brown eyes, carries gray
• Gb - Green eyes, carries blue

The calculator shows all possible combinations including hidden carriers.

Understanding the Results

The Punnett square shows all possible offspring genotypes and phenotypes.

Key Points:

• Each cell = 25% probability
• Phenotypic ratio shows eye color %
• Genotypic ratio shows allele combinations
• Zygosity shows homozygous vs heterozygous

Statistical analysis helps predict inheritance patterns.

Real-World Applications

Understanding eye color genetics has practical applications in various fields.

Uses:

• Family planning and genetic counseling
• Understanding inheritance patterns in families
• Educational tool for learning Mendelian genetics
• Predicting offspring traits based on parent genotypes

While simplified, this model demonstrates fundamental genetic principles that apply to many inherited traits.

Eye Color Rarity

Eye color distribution varies significantly across global populations.

Global Statistics:

• Brown: Most common worldwide (~79%)
• Blue: Common in Europe (~8-10%)
• Hazel: Moderate frequency (~5%)
• Green: Rarest color (~2%)
• Gray/Amber: Very rare (<1%)

Eye color distribution reflects historical migration patterns and regional genetic diversity.