how is hair texture determined genetically

"Unraveling Your Strand: How Genetics Determine Hair Texture"

By Joshua WalkerNovember 5, 2025

How is Hair Texture Determined Genetically?

Ever wondered why some people have straight, sleek hair while others have tight, curly locks? The answer lies in our genes. Hair texture, a key aspect of our appearance, is largely determined by our genetic makeup. Let's delve into the fascinating world of genetics to understand how our hair texture is determined.

Genes and Hair Texture

Genes play a crucial role in determining our hair texture. Two genes, in particular, have been identified as key players in this process: EDAR and HLA. These genes code for proteins that influence the shape and size of our hair follicles, which in turn dictate our hair texture.

EDAR Gene

The EDAR gene, short for Ectodysplasin A Receptor, is a gene associated with hair texture. A specific variant of this gene, called EDAR370A, is prevalent in East Asian populations and is linked to straight hair. This variant leads to the production of a protein that causes hair follicles to grow in a straight shape, resulting in straight hair.

Hair Structure of Different Countries: Global Hair Texture Guide 🌍✨

How Hair Texture Discrimination Is Finally Being Addressed Legally - Hailey Glow

"Genetics determine whether hair is naturally curly or straight." says in the curly handbook. "The fiber of the straight hair (top) is in a shape of round then the strand of the curly hair (bottom) is oval shaped." These are the differences between straight & curly hair. Curly Hair Follicle Under Microscope, Microscope Curly Hair Follicle, Split End Under Microscope, Curly Hair Split Ends Microscope, Secondary Follicle, What Does Curly Hair Look Like Under A Microscope, Curly Hair Under Microscope, Curly Hair Under A Microscope, Hair Follicle Structure

HLA Gene

The HLA gene, or Human Leukocyte Antigen, also influences hair texture. This gene is part of the immune system, but certain variants of it are associated with curly hair. The exact mechanism by which HLA influences hair texture is not yet fully understood, but it's believed to affect the shape of hair follicles, leading to the formation of curly hair.

Inheritance Patterns

The inheritance of hair texture is complex and not fully understood, but it's believed to follow a polygenic inheritance pattern. This means that multiple genes, along with environmental factors, contribute to the final hair texture. The EDAR and HLA genes are just two pieces of the puzzle, and many other genes likely play a role as well.

Hair Types Explained: Straight, Wavy, Curly & Coily Hair Guide

What Is Hair Theory, Hair Knowledge, Hair Texture Diagram, Curl Texture Chart, Curl Pattern Guide, Hair Curl Pattern Chart, Learn Hair Styling Terms, Hair Theory Notes, Natural Curl Pattern Chart

How to find your Hair texture chart guide for right hair care routine

Genetic Variation and Hair Texture

Hair texture is a continuous trait, meaning it varies along a spectrum rather than falling into distinct categories. This is reflected in the wide range of hair textures we see in the human population, from straight to tightly curled. The variation in hair texture is thought to be due to the different combinations of genes and their variants that each person inherits.

Environmental Factors and Hair Texture

While genetics play a significant role in determining hair texture, environmental factors also contribute. For instance, exposure to sunlight can lighten hair color, and certain chemicals can alter hair texture temporarily. However, these changes are not permanent and do not alter a person's inherent hair texture as determined by their genes.

Hair Texture and Evolution

The variation in hair texture among human populations is thought to have evolved due to adaptation to different environments. For example, tightly curled hair may have been advantageous in hot, humid climates as it helps to trap sweat and cool the scalp. Conversely, straight hair may have been advantageous in cooler climates as it allows for better heat retention.

How to determine your hair texture guide for Right hairstyles & 101 hair care

Understanding Hair Textures: A Simple Guide to Fine, Medium, and Coarse Hair

Different Hair Textures Chart, Hair Chart Texture, Curly Hair Texture Chart, Curly Texture Chart, Curly Hair Pattern Chart, Hair Texture Number Chart, Curl Texture Chart, Hair Types Chart Texture, Hair Curl Pattern Chart

Hair Texture Choosing The Right Hair Texture, Curly Hair Types Guide, Hair Texture Chart With Different Curls, Hair Texture Comparison Chart, Understanding Hair Curl Types, Black Hair Texture Chart, Black Hair Types Texture, Curl Texture Chart, Hair Chart Texture

Future Research

While significant progress has been made in understanding the genetic basis of hair texture, there is still much we don't know. Future research is needed to identify the other genes involved in hair texture and to understand how these genes interact with each other and with environmental factors. This knowledge could lead to new treatments for hair disorders and a deeper understanding of human diversity.