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Some people can curl up the sides of their tongue to form a tube shape. In 1940, Alfred Sturtevant observed that about 70% of people of European ancestry could roll their tongues and the remaining 30% could not. Before presenting the literature review, the currently used race-based taxonomy is briefly visited to shed light on the interpretation of results from various studies. Other taxonomies are presented in the main review of the ‘what’ question. Understanding these geographical and genetic variations offers a fascinating glimpse into human evolution and migration patterns. Shifting from a humid area to a dry climate can alter your hair’s texture.
Importance of understanding evolution and genetics
Understanding this interplay adds a layer of intrigue to the age-old question of which parent holds the key to the curly crown. The genetic factors of my curly hair include variations in the shape of the hair follicle, which result in the unique pattern and texture. Understanding this inheritance helps me appreciate the rich history tied to human migration and evolution through embracing the natural beauty and diversity of curly hair. Not found in all hair fibres, the medulla (in the fibre centre) is predominantly present in coarser hair fibres.
The Ultimate Guide to Wavy Hair
In various climates, the evolution of curly hair has been influenced by environmental factors. For example, in sub-Saharan Africa, the genes favor tight, curly hair to provide protection from the intense sun and heat. Curly hair in our family trees often links us back to these ancestors. Genes that cause curly hair are dominant; they show up even if only one parent passes them down. If the study intends to characterize the follicle, it would belong to the follicle sublayer in the micro-layer of the characterization level.
Is Curly Hair Genetic?
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 is a beautiful and distinctive hair texture that has captivated people for centuries.
(a) Curvature fibre model
The Goddess Strength Shampoo and Conditioner are the key to keeping strands from becoming brittle or dry. Curly hair is not particularly rare, with approximately 90% of the world’s population having some curl. Up until now I have been implying that all 10 genes have the same effect. Lasisi says the next stages of the research will be to look for genetic evidence that may support the theory. The researchers then made a model of heat loss under different conditions and studied it under the typical conditions in equatorial Africa where early hominins are thought to have evolved. A new study—involving a mannequin wearing wigs in a wind tunnel—reveals how.
Some have only a temporary effect (like hair curlers), while some treatments make the changes more permanent, although these have some side effects. So, if you’re wondering why your hair acts a certain way in different weather, or why it’s changed over time, it might be down to these environmental and lifestyle factors. Each of us inherits two versions (alleles) of every gene, one from each parent. When one allele is dominant over the other, it’s like having a louder voice in a conversation; it expresses itself even in the presence of another allele. This dominant allele masks the effect of the other, which is termed as recessive.
Myth: Curly Hair Can be Permanently Straightened
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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. 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.
To find out more about the influence of genetics on hair texture:
The ‘how’ question highlighted that some comparative studies are pointing towards phenotypical curly fibre trends that are independent of race. It also showed that it is clear that a race-based taxonomy, without at least accounting for different curl types, leads to confounding effects. The ‘how’ question, again, highlights the need for large-scale studies based on phenotypical taxonomies in order to better understand and describe fibre behaviour under various conditions. For curly hair fibres, there exists a toe-region prior to the linear elastic region. In today’s world, there’s a growing movement towards embracing one’s natural hair texture. Recognizing the beauty in every type of curl, wave, or straight strand is vital for self-acceptance and appreciation.
Volunteers were 151 individuals of European ancestry who donated 20+ hair fibres each; these were then classified as types I–IV according to STAM. The aim of the study was to evaluate factors (instrumentally and via survey) that contribute to the perception of ‘fine hair’. Accordingly, there was a strong correlation between self-perception of ‘fine hair’ and low average fibre diameter, hair density, stiffness and break force load. Statistical analysis showed that hair at a STAM class threshold of 2.5 (below III, but above II) fell in the category of ‘fine hair’, whereas hair above this threshold was categorized as ‘not fine’. Fibres in the latter group were thicker, stronger and stiffer, with a greater scalp density.
Understanding the history and genetic diversity of curly hair allows us to appreciate and embrace the natural beauty that comes with it. The evolution and inheritance of curly hair across different ethnicities showcase the rich tapestry of human ancestry, highlighting the uniqueness of each individual’s genetic makeup. Unraveling this genetic inheritance sheds light on the diverse origins of curly hair across different ethnicities and its evolutionary significance. By comprehending these genetic underpinnings, we gain insights into our ancestral roots and celebrate the beautiful tapestry of natural diversity that encompasses various hair types.
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Yet, the purpose of this work is to present a platform from where equivalent theories can be understood and compared in order to highlight knowledge gaps and focus investigations. Therefore, from a multi-disciplinary viewpoint, engineering and manufacturing principles would suggest that ultrastructural dimensions and arrangements belong to the ‘what’ question asked about curly hair. Fibre behaviour studies may have a characterization or comparative nature. In the first instance, fibre behaviour studies are used to determine how a curly fibre would deviate from its normal character under certain (usually stress) conditions. Monitoring the behaviour of the fibre, pre-selected fibre properties are characterized, e.g. application of mechanical stress is used to characterize the fibre's material strength, bending and torsional properties. Behaviour studies with a comparative nature aim at establishing performance ranges of specific types of fibres.
In summary, the prevalence of curly hair in different populations and regions is complex and ongoing, reflecting human diversity and adaptability. The same genes affecting curly hair in other populations, like TCHH, EDAR, KRTAP6-1, and PRSS53, also influence hair in Asian and Middle Eastern groups. However, the prevalence and distribution of these genes and their variants can vary. 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.
When exploring the factors that may cause curly hair to go straight later in life, ensuring proper nutrition becomes crucial. A deficiency in key vitamins and minerals might impact the hair’s natural curl, emphasizing the significance of a wholesome diet in maintaining and influencing hair texture throughout one’s lifetime. If both parents carry the recessive gene for curly hair, there’s a chance, like a genetic roll of the dice, that their child will express those captivating curls. It’s like unraveling a genetic mystery, where the seemingly straight-haired puzzle pieces can unexpectedly combine to create a curly-haired masterpiece. Curly hair is often determined by your genetic makeup, and it’s fascinating to explore which parent contributes more to this trait. While both parents play a role, the gene responsible for curly hair is not always equally expressed.
Chemical deposition via endogenous absorption of substances facilitates a non-invasive means to trace chemicals to which the individual was exposed, long after pathological evidence of exposure. Endogenous absorption is affected by chemical treatments (permanent and semi-permanent) of the hair, which have been found to markedly alter the content of certain drug markers used for hair analyses [103]. False positives for substance abuse are often reported in forensic investigations. In the USA, there appears to be a higher positive rate for drugs in African (assumed curly) than in European hair (assumed near straight). The view that the elevated rate is attributable to ancestry has recently been challenged [104].
Illnesses, medication, and treatments like chemotherapy can influence your hair’s appearance. By engaging with this site, you agree that the information provided here is solely for informational purposes. For any specific medical inquiries, please seek advice from your doctor. Next, the catagen phase is like a transition period where the hair stops growing and prepares to rest.
The interplay between nature and nurture becomes evident as we explore why and how curly hair may transition to a straighter form later in life. While the activities and fundamental roles of the different follicular components are not yet fully understood [23], the follicle morphology is reasonably well described. This synoptic overview (summarized from comprehensive descriptions in [24–28]) presents a basis for elucidations pertaining specifically to curly fibres.
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