Kıvırcık saçlar ayaklarda çıkmaz, çünkü kıvırcık saç geni, düz saç genine baskındır ve bu durum genetik olarak belirlenir 13. Dolayısıyla, saç şekli genetik şifreler tarafından kontrol edilir ve ayaklarda saç foliküllerinin yapısı kıvırcıklığa uygun değildir 5.
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