Many people put a significant deal of effort and money into maintaining their hair's appearance. The genetics of hair color is still a mystery, despite the fact that we know why it is colored chemically. Humans' natural hair hues, from blonde to black to brown to red, may shed light on our evolutionary history.
Sexual selection, according to scientist Luigi L. Cavalli-Sforza, may be behind the wide range of hair hues we see today. In the same way that natural selection impacts evolution, sexual selection has an impact. In contrast to natural selection, sexual selection, on the other hand, focuses solely on features related to finding a mate for reproduction.
Diversity in hair color is possible because rarer hair hues may have appeared by chance and given its owners an advantage when it comes to finding love. New hair hues would have been passed on to future generations had they been more successful in finding partners and conceiving babies.
Two pigments, eumelanins and pheomelanins, are responsible for the vast majority of human hair's natural hues. Any pigment or pigmentation in the hair or skin is referred to as "melanin." Red pigments are made by pheomelanins, whereas black or brown pigments are made by eumelanins.
The amount of eumelanins in a strand of hair is what ultimately determines the color of the hair. Blond hair is the result of a lack of brown eumelanin production. Gray hair can be caused by a loss of black eumelanin in the hair follicles. The darker your hair, the more eumelanin you have.
Pheomelanins (a reddish pigment) are found in the hair of nearly everyone. Pheomelanins are produced in large concentrations by those with real red hair.
Genotypes, or the individual sequence of DNA that makes up a person, are expressed physically as phenotypes. Because genes interact in a variety of ways, it isn't always easy to link physical qualities to specific genes. Hair color is an example of genetic complexity whose underlying basis is still unclear. Hair color is thought to be inherited via a dominant/recessive gene connection or a multigene locus.
Recessive-to-Dominant Genomic Relationship
It is necessary for a child to inherit two alleles (one from each parent) for a trait (such as hair color) to be expressed in her phenotype in a dominant/recessive gene connection (or appearance). Even though a dominant/recessive model could assist explain how two dark-haired parents could give birth to a blond child, it is unable to account for the wide range of human hair color differences that are now seen.
Hair and aging
Because melanin production in the hair follicles has stopped, the hair turns gray, as explained above. Our follicles have a finite number of pigment-producing cells when we are born. Genetics plays a role in determining the exact value. Gray hair occurs as a result of a decrease in pigment production with aging. Premature graying can be accelerated by poor diet, smoking, and certain conditions.
When was the last time you saw a person with naturally colored hair?
Melanin, the pigment that determines our skin color, is responsible for determining the color of human hair. Unfortunately, both types of naturally blue hair are available in only drab shades.
There are two types of eumelanin: brown-black eumelanin and reddish-yellow pheomelanin, which is found in the hair of blondes and redheads. Because of this, no one is completely clear why we've only got these two types of pigments; the best idea is that they evolved to help us evade predators in the African savannah millions of years ago. Those who want their hair to be able to withstand the rigors of evolution have no alternative except to visit the chemists and get more fascinating hair colours. To learn more about human hai, visit the virginhairbuy.