Eye color is largely controlled by two key genes (OCA2 and HERC2). Brown is dominant over green, and green is dominant over blue. This tool uses a simplified two-phenotype inheritance chart based on the parents' expressed colors. For example, two brown-eyed parents have about a 75% chance of a brown-eyed baby, an 18.75% chance of green, and a 6.25% chance of blue. Blue-eyed parents almost always have a blue-eyed baby, but rare genetic surprises (about 1%) keep things interesting.
瞳色主要由 OCA2 与 HERC2 两个关键基因控制。棕色对绿色为显性，绿色对蓝色为显性。本工具基于父母表型的简化遗传图表。例如：两位棕色眼睛的父母，宝宝约 75% 概率棕色、18.75% 绿色、6.25% 蓝色；蓝色眼睛的父母几乎总是生出蓝色眼睛的宝宝，但约 1% 的罕见遗传惊喜让结果保持有趣。
Why do many babies' eyes change? Melanin production ramps up over the first 6–12 months. Many babies born with blue or grey eyes slowly develop their permanent color — so the chart predicts the likely adult eye color, not necessarily the color at birth.
为什么很多宝宝的眼睛会变？黑色素的生成在出生后 6–12 个月逐渐加强。许多出生时蓝色或灰色的眼睛会慢慢变成最终颜色——所以本工具预测的是成年后的瞳色，而不一定是出生时的颜色。
