Hair shape is influenced by the way hair follicles are angled and shaped, largely driven by a small set of genes (including trichohyalin). In a simple dominant model, curly dominates wavy, which dominates straight. The tool applies that ladder to the parents' hair types and returns a probability spread. Real life is fuzzier: many babies lose their newborn curl or gain waves they never had as the follicle changes shape.
发质取决于毛囊的角度与形状，主要由一小部分基因（包括 trichohyalin）决定。在简单显性模型中：卷发 > 波浪 > 直发。本工具按这个阶梯对父母的发质计算概率分布。现实更复杂：许多宝宝会失去新生儿的卷发，或长出从未有过的波浪，因为毛囊形状会改变。
