PSI Barbering Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 580

What is responsible for the natural wave patterns in hair?

Environmental exposure

Genetics

The natural wave patterns in hair are primarily determined by genetics. The structure of individual hair strands, including their shape and the way they grow, is inherited from one’s parents. Genetic factors dictate the specific formation of the hair follicle, which influences whether hair is straight, wavy, or curly. The type and distribution of bonds within the hair, such as hydrogen bonds and disulfide bonds, are also influenced by genetic makeup, affecting the overall wave pattern.

While environmental exposure, hair care routines, and hair length can all have effects on hair's appearance and can alter its style temporarily, they do not dictate the inherent wave patterns that each individual possesses. Environmental factors might impact hair texture and condition, but the fundamental wave nature is a genetic trait.

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Hair care routines

Hair length

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