Why not everyone is beautiful

When choosing attractive partners, they quickly spread the " best " genes throughout the population. But why do ugly faces or figures still exist today?

Not everyone has an ideal face like Brad Pitt or Angelina's passionate lips. Many people with faces cannot "love", but they still marry like many others."It's a big question with evolutionary biology," said lead researcher Marion Petrie from Newcastle University.

Lek paradox

For some species, females choose the sexiest guys to mate: for example, the roof only paired with the guys with the longest tail. Deeper, these attractions are often indicative of certain gene compatibility, such as disease resistance that young children can inherit.

Angelina Jolie (Photo: cinemacomrapadura)

According to this selection method, if females only reproduce with the most attractive males, then all males will be equally attractive, and sex selection will not take place (in the case Of public, all males will have the same long tail. But it is clear that the reality is not so, there are movie actors, there are also hunchback, no matter whether it is in humans, birds or other animals.

This is called the " lek paradox " (lek is a group of males assembled for mating), which hurts biologists evolving for decades.

However, a group of British scientists said they found the answer to this paradox in "DNA repair tools" in humans.

The "DNA repair tool" is essentially a series of molecular processes that repair damage in the cell's DNA. Under normal conditions, this will lead to gene mutations. Mutations can be harmful, causing tissue to break down, lose function or develop into tumors. There are also beneficial mutations.

A few mutations affect this repair process itself, and make it less effective, resulting in more mutations as the damage is not corrected."You can increase or slow down your own mutation," Petrie said. The greater the rate of mutation, the more diverse the population.

Using a computer model, Petrie found that the greater the genetic diversity due to the mutation, the more likely it was to reduce the genetic diversity caused by sex selection.

In some previous works, Petrie pointed out that men with higher disease resistance genes are considered to be more attractive in the eyes of women. Because these men are more likely to be paired, they will pass on that ability to the next generation, allowing them to lessen their desire to choose a mate according to their appearance.

Because of this " spaciousness " the public tail can be short and arbitrary and some of us definitely can't be as beautiful as the top American stars.

T. An