Experts from the University of Montana’s claim that such outstanding body parts of different animals, such as horns and claws are developed from the tissues with increased sensitivity to insulin. Huge horns of a rhinoceros beetles and deer, some exaggerated claws of crabs and prawns owe their impressive size is insulin. This hormone plays a role of a "guarantor of integrity ’: the sick, malnourished males will not be able to meet the growing antlers with all necessary materials. American scientists have studied the development of a type of rhinoceros beetles Trypoxylus dichotomus. The males of these beetles on the front of the head have a great outgrowth of reaching the two-thirds of their length. Males use this horn to ward off rivals from the females and protect their passions. It is clear that the benefits are males who have long horn.
The researchers found that the tissues that form the horn at the rhinoceros beetles, are hypersensitive to insulin and insulin-like factors. They have eight times stronger inculinu sensitivity than other parts of the body beetle. Experts explain that this hormone activates download glucose into the cell and its cleavage. Thus, the stronger the cells are dependent on insulin, so they consume more glucose and, consequently, the greater the energy produced. This means that these cells grow and divide to be more active than others.
There is evidence that insulin comes with the development of the claws of some crustaceans that live in the seas, and the horns of deer. But before one of the scientists compared the sensitivity of hypertrophied and normal tissues. So experts from the University of Montana became the first who held a similar study.
Dependence of the size of secondary sexual characteristics (horns, claws) in male insulin is a guarantee of honesty in sexual selection. It is clear that males with more luxurious horns have a great chance to win a vending female and male if it turns nothing more unremarkable? What if he is predisposed to disease and has a bad mutation? In this case, bushy horn would work as a decoy. However, it is actually very simple and honest: as the size of the claws and horns dependent on insulin, the large size of these parts of the body suggests that they went a lot of nutrients, that is, their owner is able to get food, strong, healthy and has no deleterious mutations, otherwise he would have been unable so raskormit his horn. Consequently, the female can not hesitate to jump into the arms of the gentleman, as his great horn ensures healthy genes.
According to the materials Sciencemagis.ru