A baby eye color calculator utilizes polygenic mathematical modeling based on chromosome 15 loci (specifically the HERC2 rs12913832 and OCA2 gene complexes) to estimate the phenotypic odds of an infant developing brown, blue, or green eyes.
Polygenic Architecture
Iris pigmentation is determined by multi-locus gene interactions rather than a single Mendelian switch.
HERC2 Master Switch
A single nucleotide polymorphism (SNP) in intron 86 of HERC2 regulates OCA2 expression.
Melanocyte Maturation
Infant irises shift pigmentation over the first 6 to 36 months as UV exposure triggers melanin synthesis.
Baby Eye Color Calculator: Decoding Polygenic Inheritance and Melanin Expression
The anticipation surrounding an infant's physical traits is one of the most celebrated aspects of parenthood. Modern human genetics confirms that eye color is a polygenic quantitative trait governed by intricate epistatic interactions across chromosomes 15 and 19.
Parental Genetic Probability Matrix
| Mother's Phenotype | Father's Phenotype | Brown Odds (%) | Blue Odds (%) | Green / Hazel Odds (%) |
|---|---|---|---|---|
| Blue | Blue | < 1.0% | 99.0% | 1.0% |
| Brown (Homozygous) | Blue | 100.0% | 0.0% | 0.0% |
| Brown (Heterozygous) | Blue | 50.0% | 37.5% | 12.5% |
| Green | Blue | 0.0% | 50.0% | 50.0% |
| Brown (Heterozygous) | Brown (Heterozygous) | 75.0% | 18.75% | 6.25% |
| Green | Green | < 1.0% | 25.0% | 74.0% |