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

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

Is curly hair common in Mexico? - Quora

Do most Indonesians have curly hair? Why or why not? - Quora

Does a white person with very curly hair have the 'right' texture for dreadlocks, or is the definition different? - Quora

What race or ethnicity does curly hair come from? - Quora

Does having curly hair denote an African ancestry? - 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

Is it common for Native Americans/indigenous Aboriginal Canadians to have naturally curly hair? - Quora

What is it like being an Asian with naturally wavy/curly hair? How many Asians do you know that has this type of hair? - Quora

Can a white person have extremely curly hair? (as shown on the pic) Is it a sign they might have had an African ancestor in the past? - Quora

Is curly hair considered an African hair or a Middle Eastern hair? - Quora