How is it possible that some Caucasian people have very curly hair

Which race/ethnicities tend to have certain hair textures (curly, straight, wavy hair)? - Quora

Why do perms straighten Afro hair but cause Caucasian hair to become curly? - Quora

Can white people have thick/coarse hair without it indicating African admixture? - Quora

I have wavy/curly hair and ancestry DNA told me I have naturally straight hair. Does that mean that straight hair was/is in my genes? I'm so confused. - Quora

Can white people have curly hair naturally? - Quora

Does curly hair in Caucasians most likely originate as a holdover from Neanderthal or African ancestry or as an independent mutation? - Quora

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I have wavy/curly hair and ancestry DNA told me I have naturally straight hair. Does that mean that straight hair was/is in my genes? I'm so confused. - Quora

Why is curly hair genetically dominant over straight hair? - Quora

Why do Polynesians have curly hair? - Quora

Are red, curly headed people rare? - Quora

Why don't Chinese people usually have curly hair? - Quora

Are Americans born with straight hair? - Quora