Is Curly Hair Recessive Or Dominant Trait?
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Just like in Mendel’s experiments, humans have been using genetics for selective breeding in animals, as well as fruit and vegetables, for thousands of years. They learned that all types of hair gave some protection from the sun, but tightly curled hair gave the best protection and minimized the need to sweat—a significant finding, says Lasisi. To about 75% of us, the chemical PTC (phenylthiocarbamide) tastes very bitter. The ability to taste PTC is controlled mainly by a single gene that codes for a bitter-taste receptor on the tongue. Different variations, or alleles, of this gene control whether PTC tastes bitter or not. Interestingly, some of these are speculated to be under epigenetic control, which means that how they are expressed can be inherited from your parents or even be affected by your environment.
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These genes may have been inherited from previous generations and can be passed down to their children. The shape of the hair follicle determines whether our hair is straight, wavy, or curly. If the follicle is symmetrical, it produces round hair shafts that give you straight hair. However, an asymmetrical follicle produces oval or flattened hair shafts, resulting in curly or wavy hair. Curly hair’s texture is determined by genetics and the structure of hair follicles, which can’t be permanently altered by external treatments.
Observable Human Characteristics
Similarly, a straight-haired mother might pass down two recessive alleles for straight hair. From the dominant and recessive dynamics of hair genes to the influence of evolutionary factors and cultural perceptions, curly hair genetics represents a unique aspect of human diversity. The genetic role in determining curly hair is both fascinating and complex. The interplay of genes such as TCHH, EDAR, KRTAP6-1, and PRSS53, and their interactions with environmental factors, shows the intricate biology that leads to the diversity of hair textures we see across populations. It’s not just about whether curly hair is dominant or recessive; it’s about understanding the intricate interplay of genetics, natural selection, and cultural factors that shape our hair.
Myth: Curly Hair Can be Permanently Straightened
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The information stored in our DNA dictates many aspects of our appearance, including the texture and color of our hair. This genetic blueprint is inherited from both parents, with each contributing vital pieces that create the final look. In summary, the prevalence of curly hair in different populations and regions is complex and ongoing, reflecting human diversity and adaptability. Curly hair is also present in European populations, especially in areas with a mix of genetic backgrounds like the Mediterranean, the British Isles, and Scandinavia. In many African populations, particularly those from sub-Saharan regions, curly hair is quite common.
How to take care of curly hair types
Understanding the genetics of curly hair and straight hair not only highlights the intricacies of genetic transmission but also celebrates the diversity of hair types across individuals and families. It’s an additive trait, meaning multiple genes contribute to the final texture. From afro-textured hair to wavy locks, the curl pattern on your hair is the result of the biology and chemistry of your hair follicles. According to a 2019 research study, your curl type is linked to the structure of the follicle and how the fiber grows above your scalp. Last but certainly not least, 4C hair is the tightest of the curly hair types and experiences the most amount of shrinkage. It can resemble 4B but has a higher percentage of breakage (it can break extremely easily) and shrinkage, and also experiences the least amount of curl definition of all 4 hair types.
Absorption of chemical substances (in any medium) is strongly affected by the hydrophilicity/lipophilicity, pH and other substances in the absorbing medium. As mentioned, there is race-independent direct correlation between fibre shape and cortical cell composition [56,64], and the chemical composition between PCs and OCs differs [64,65]. Furthermore, to the best of our knowledge, there are no reported data on lipid distribution in different hair forms, only race-based lipid distribution reports [17,18,43]. It was shown that, after depletion of exogenous lipids, absorption kinetics remained constant, but desorption kinetics changed, leading to a loss of total moisture content.
Many owners of curly hair complain about their constant tangles, dryness, and therefore a careless a... The packing of the IFs inside the cell contributes to the shape of the cortical cell (adapted from [52,53]). In this blog post, we will discover effective tips and tricks to preserve those luscious curls while getting a good night's sleep with wet hair. Implementing these simple yet effective techniques will leave you ready to embrace a new day, with gorgeous, frizz-free curls intact.
With so much curl diversity within the natural hair community, it can be hard to figure out where you fit—and more specifically, what your curl type is. If you’ve ever found yourself asking "What is my curl type and how do I care for it?" We've got expert-level answers. As we unravel the intricacies of hair evolution, the once-binary notion of dominant or recessive traits expands. Curly hair, it seems, is not bound by strict genetic rules but is responsive to the diverse influences it encounters.
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Inheritance Pattern of Curly Hair
The bilateral arrangement of OCs and PCs is sometimes described as a mechanism, or as a cause of fibre curvature [52,55]. Recent work has indicated that cortical cell lengths are longer on the convex than on the concave sides of the fibre curl [55]. As such, the authors contested the notion that bilaterality causes curvature, but rather argue that cortical cell length is more likely to have a causal relationship with curvature than cell type or ratio. This premise is more accommodating of observed variations in geometric arrangements than the first. ‘Causation’ answers the ‘why’ question, whereas ‘appearance’ describes observed structures and patterns, i.e. the ‘what’ question. The ‘bilateral pattern’ is a description of the physical appearance of the cortex as viewed microscopically.
Results showed a significant difference in cuticle lipid content, as well as different absorption/desorption dynamics between the white and brown hair. White fibres exhibited decreased absorption capacity and increased rate of permeability. This raises a question about how these observations would differ between fibres of different curliness in the same population. If true, it would not be irrational to suggest dissimilarities in biochemical environment (among curly and non-curly fibres) that would affect absorption. This would be critical for correct data interpretations, especially in medicine, pharmacology, forensics and toxicology. Hair fibres show wide diversity across and within all human populations, suggesting that hair fibre form and colour have been subject to much adaptive pressure over thousands of years.
This rarity is due to the specific genetic combinations required to produce the curly hair texture. Straight hair is considered “recessive.” To put that in simple terms, that means that if one parent gives you a curly-haired gene and the other parent gives you a straight-haired gene, you’ll be born with curly hair. The OG of supermodels Naomi Campbell recently appeared on the cover of British Vogue proudly rocking a full head of natural curls.
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