Recessive features, such as red hair, can pass down across generations because they can hide in a carrier behind a dominant trait. To be observed, the recessive characteristic requires another carrier and a bit of luck. This implies that it may take several generations for its presence to be felt. In some cases, a feature may disappear from a population because everyone in them is genetically identical, so any one individual could carry the gene and pass it on to their children. If this happens over several generations, then the feature will disappear completely.
Redheads are born red-haired, but over time their color can fade. The amount of skin pigment (melanin) produced by your body changes as you age. As melanin levels decrease, your skin becomes paler. People who are more than one generation removed from their roots are often considered white or almost entirely white. However, since melanin production varies between individuals, the color of distant descendants may vary significantly from one to another. Some people with very light-colored skins may not even realize they have some Native American ancestry due to lack of knowledge about their genetic history.
It's natural for humans to want to know our past. History books contain many stories of people who were able to connect their blood lines to other blood lines, which helped them find out more about themselves and their families. Genealogy is the study of these connections.
A widespread fallacy is that when a characteristic is uncommon, it might be lost due to a dilution effect, in which the few individuals who have the gene do not reproduce, and so the trait is lost to future generations. Despite the fact that it is recessive, red hair is unlikely to be affected by this impact.
The genetic basis of red hair is two different mutations in one gene, called MC1R. Because these mutations are detrimental to protein function, there must be strong selection against individuals with them. For example, people with red hair tend to experience more sunburns than others, which can lead to skin cancer. In addition, some occupations (such as police work) require individuals to wear protective gear that is only available in dark colors, so having red hair would be a disadvantage for these workers.
Because red hair is caused by mutations that are harmful to health or survival, there is no danger of extinction due to a loss of these genes from the population.
They, like recessive genes, can skip a generation. There aren't many red-haired genes in the human gene pool. Is it true that redheads are becoming extinct? "NO!" is the answer.
The frequency of red hair varies between populations. In some communities, such as in India, it is very common. But overall, the number of people with red hair is stable. It isn't going up or down.
People have been wondering if redheads are disappearing from the world for hundreds of years. Ancient Greek historians, for example, noted that the Roman emperor Nero was white-skinned and claimed that his mother's side of the family was Italian.
In modern times, there have been reports of red-headed babies being abandoned by their mothers. This may be because they look like Nero - pure white skin with pink eyes. The mothers may worry about being taken for money by someone who sees them as a marketable product!
There are also reports of women lying in wait for months to trap red-headed boys; then selling them for a large sum of money to men who want children of their own color.
Today, most people with red hair have brown or black hair too. They just happen to be born with more red than other colors.
Both parents can have recessive gene features, which they can pass on to their offspring. For example, if both parents have red hair, a kid obtains the majority of the genetic material for red hair, increasing the likelihood that they will have red hair to nearly 100%. If only one parent has the red hair gene, the child still has a chance of getting a red-haired offspring by mating with someone who does not have the gene.
The probability that a child will get each of its genes from one parent is called the gene frequency. For example, if both parents are known to have red hair, then the gene frequency for red hair is 1.0. If one parent has red hair and another does not, then the gene frequency for red hair is 0.5. Genes are passed down from parents to children either through the mother's or father's body. A child receives an equal number of genes from each parent, so the gene frequency for traits such as hair color is always 0.5.
Just because two people have the same trait doesn't mean that they got it from the same source. For example, if a family has all four siblings affected by diabetes, the parents might want to know if they had any medical problems while pregnant or if there was anything different about their diet during pregnancy. The reason is that this could be evidence that the disease was transmitted from parent to child via their genes.