Why does skin colour varies from person to person?
About 600 million people live in our vast world. None of them look same. Some are black, some are white, some are in the middle. Everyone knows that through genes, skin colour is passed from parents to child. That is, the genes reveal the characteristics of the parents in the offspring. And this gene is passed from one generation to another through chromosomes. The human body has 23 pairs or 46 chromosomes. The genes that control this trait are located in DNA. The location of the gene on the chromosome is called locus. DNA is located on the chromosome.
That is why the chromosome is called the bearer and carrier of heredity. And the gene is called the unit of heredity. If the traits of one of the parents are more observed in the child, then it should be understood that the gene of the one whose traits are being expressed more is having the most effect. Many times the characteristics of the child do not match with the parents. In this case, none of the parents' genes can reveal their characteristics.
In other words, the gene remains hidden. And the characteristics of the ancestors are revealed. That is, the genes of the ancestors are manifested. Now let's talk about the causes of diversity. This diversity is due to the characteristics of the parents (such as eye colour, skin colour, temperament, hair colour, etc.) being expressed in the child's body. But the question is, how do these colour variations occur? There are different types of proteins in our body. One of them is melanin.
Melanin is a pigment that contains dyes. It contains pigments. It is secreted from melanocyte cells in the body. The signal for melanin is C18H10N2O4. People who have high levels of melanin in their body have darker body colour i.e. black. And those who have less amount of melanin in their body, their body becomes less pigmented, that is, white. This melanin is mainly responsible for different body colour. This melanin is also responsible for the difference in the colour of Irish, hair and eyes. It is passed down from one generation to another. There is another type of people whose skin, hair and fingernails are white. In their case, there is no melanin in the body.
Although or if there is, it is very little. These are called albino type. In normal people, skin colour is controlled by multiple genes. But in the case of albino type humans, skin colour is controlled by a single gene. Albino type people get skin burns when they are exposed to sunlight. That is why they always have to stay in a shady place. If you want to go out in the sun, you have to keep yourself in the shade with an umbrella or something else. There are very few albino type people in the world. Older hair, beard turns white. This is because the amount of melanin in the human body decreases with age. As a result, the hair, beard and moustache change colour and become white. At present, at a young age (40-50 years), the hair of many boys and girls turns white. The amount of melanin in their body decreases rapidly.
As a result, such problems occur. It is important to keep the amount of melanin in the body normal to avoid all these problems. To increase melanin in the body, you need to eat antioxidant foods, such as dark chocolate, colourful vegetables, vitamins and minerals. These help to keep the amount of melanin normal. Melanin protects the body from UV rays and in high doses often interferes with the skin cancer process.
-Ahsan Ullah