No, not all people with curly hair are directly related; curly hair is a common, complex genetic trait influenced by multiple genes and ancestral populations, appearing across many ethnicities (African, European, Asian, Native American) with varying frequencies, meaning curls can emerge independently in different family lines and regions, not just from one shared ancestor. While genetics play a big role, the exact combination of many genes, like TCHH, determines the shape, and environmental factors also influence it, leading to diverse curl patterns in unrelated people.
Since curly hair is a dominant gene, there is a good likelihood that one or two curly-haired parents will produce a curly-haired cutie. But genetics are tricky, and there's a chance that two parents with curls could carry the straight hair recessive gene, and pass that onto their offspring.
So, it's possible for the child to have a different curl pattern than either parent. It depends on the specific genes they inherit from each parent, and there can be a range of possibilities. It's not solely determined by the parents' hair type but influenced by various genetic factors.
In really basic terms, the curl gene has 2 alleles, meaning your parents have 2 alleles each and one, none or both could be a curly gene, but if you're handed down 1 out of 4 curly alleles, then it's possible you'll be born with curls! Boom!
It's possible for both your father and grandfather to be heterozygous for curly hair (a curly hair gene and a straight hair gene). A quick google search says you may have wavy hair in that case, as one copy of curly leads to waves, two copies leads to curls.
Type 1A Hair
This is considered the rarest hair type because it lacks any natural bend. People with 1A hair often find it difficult to hold curls, even with heat styling. The advantage of this hair type is its naturally sleek appearance, but it requires careful handling to prevent breakage.
Your biological father can pass on physical traits such as your biological sex, eye color, height, puberty timing, fat distribution, dimples, and even risk factors for certain health conditions.
Naturally, curly hair is relatively common but varies by population and ethnicity. Globally, it's estimated that about 11% of people have naturally curly hair. The prevalence can be higher or lower in specific regions due to genetic diversity and ancestral backgrounds.
What race has curly hair? People of African descent typically have curly hair. Curly hair has a defined curl pattern that ranges from loose waves to tight coils. However, people of other races can also have curly hair, depending on their genetic makeup.
Why do Gen Z all have curly hair? Curly hair has become more popular among Gen Z due to cultural shifts that embrace individuality and natural beauty. Many celebrities and influencers are embracing their natural textures. Social media platforms like TikTok and Instagram have helped promote curly hair trends.
The gene for curly hair in Caucasians
It has been long established that curly hair is a dominant trait in Caucasians and straight hair is recessive.
One interesting aspect is the effect of changing hormones on hair texture. During puberty, the surge of oestrogen in pre-teen and teenage girls can physically change the shape of hair follicles. Straight hair can become curly (and curly hair can become straight), seemingly overnight.
Hair morphology is one of the more conspicuous features of human variation and is particularly diverse among people of European ancestry, for which around 45% of individuals have straight hair, 40% have wavy hair, and 15% have curly hair.
Busting the Myth
Ultimately, hair loss isn't as simple as inheriting it from one side of the family. Instead, it's a blend of genetic influences that come from both parents.
African-American hair comes in a range of textures, but the most common hair type is curly with lots of volume. This curly quality is the product of the shape of the hair follicles.
Type 1A is the rarest hair type and is stick-straight without even a hint of a wave.
Individuals of African ancestry, for example, are more likely to have curly hair due to the oval shape of their hair follicles. Additionally, the Keratin Associated Protein (KAP) cluster genes, responsible for the structure of keratin fibers, have been found to have variations in many African populations.
Curly hair has for centuries always been linked to individuals of Middle Eastern and African ethnicity. We find it interesting that such a generalisation can be made as there are always exceptions to every rule. Let's uncover the truth.
You're blessed with natural volume and texture
Another boon of curly hair is that, unlike others, we don't have to create volume. Our tresses always appear volumized and textured.
The highest prevalence of curly hair was in Brazil (42.6%) and lowest in China (5.5%).
Intelligence genes are situated on the mother's X chromosome. Thus, an intelligent mom has intelligent kids even if their fathers aren't wise. Scientists from the University of Cambridge conducted this study. The 'conditioned genes' behave differently depending on their origin.
Fathers will always pass their X chromosome to their daughters and their Y chromosome to their sons.