Eye Color Genetics: Predicting Baby’s Eye Color from Grandparents

Eye color is polygenic, but a simplified two-gene model (BEY2: brown/blue; GEY: green/blue) illustrates inheritance.

Example Pedigree

Both grandfathers: blue eyes → genotype bb (simplified).
Father: blue eyes → bb.
Mother: green eyes, brown-eyed parents → likely Gb (green/blue carrier).

Possible Offspring Genotypes & Phenotypes

With these genotypes, probabilities:

Blue eyes: 50% (bb)
Green eyes: 50% (Gb)
Brown eyes: 0% (no B allele present)

Note: Real genetics involves multiple genes (OCA2, HERC2, TYR, etc.) and incomplete dominance; this is a simplified illustration. Actual prediction requires more complex models.

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Genotype	Phenotype
bb	Blue
Gb	Green