Their chest is a product of evolution. Gorillas evolved from another species of ape that is closely related to the orangutan. There are 2 possibilities as to why their chest are different from those of other apes. One of these possibilities that it evolved by pure chance and it has no advantage. Scientists call...
Best answer: Their chest is a product of evolution. Gorillas evolved from another species of ape that is closely related to the orangutan. There are 2 possibilities as to why their chest are different from those of other apes. One of these possibilities that it evolved by pure chance and it has no advantage. Scientists call such a possibility neutral genetic drift. The other possibility is that it is adaptive, meaning it is an advantage for the gorilla to have a chest like that.
Gorillas are territorial and they beat their chest to create noise when they are excited. Such noises are louder than the noises the gorilla makes with their vocal cords. In contrast, the chimpanzee is capable of making a lot of loud noises with their vocal cords and the chimp does not beat its chest to produce sound. The orangutan does not beat its chest either, and it is not loud either. Therefore it appears that the gorilla evolved its chest so as to make noise, to compensate for its rather soft voice. The chest of the female gorilla is different as the skin appears to be less thick than the male's and they do not beat their chest.
Therefore it would appear that the gorilla evolved a thick chest in the male so that they can make noise, and these noises likely serve as territorial signals. Other gorilla males that hear the noise know that there are territorial males nearby and a fight may happen if they try to go into the territory. Other animals that are territorial do it differently. They usually make sounds using their vocal cords, as most birds do by singing. Lions, tigers, leopards and jaguars roar to declare their territories. They are called roaring cats. Many other animals, such as crickets, do not have vocal cords, but they make noise by rubbing their body parts together. Animals will often declare territories using visual displays, such as the dewlaps of a lizard, if they cannot make any sounds.
The gorilla's chest may lack hair because the hair would absorb some of the energy when the gorilla beats its chest, making the sound softer. Therefore if a mutation happens to make that area hairless, the sound can be louder. The louder sound is more advantageous because it can travel farther. That reduces the chance of another male unknowingly wanders into a male's territory and that means fights are less likely. Since fights can result in injury or even death, something that reduces the frequency of fights is advantageous, and this mutation can spread so that all male gorillas inherited this mutation that make their chest hairless.
Humans did evolve from an ape, but our closest relative is the chimp, not the gorilla. Even though all non-Africans evolved from Africans who migrated out of Africa 60,000-70,000 years ago, there is no evidence that Africans beat their chest to declare territory. Instead, humans often have war chants, and national anthems. These vocal signals may serve to signal territorial ownership. Nevertheless, humans originally evolved in the African savanna, which has little food. Our ancestors were hunter gatherers and likely nomadic, since there is no reason to stay and defend a territory if there is little food within it. They may have to walk long distances and move from one place to another just to find food. Besides, we have a louder voice than gorillas, so we probably lost a chest that may be similar to that of the gorilla if our ancestor had one. Therefore Africans, even though their chest is hairless like that of the gorilla, do not have skin that is as thick as that of the gorilla. Besides, their entire body is hairless. Europeans and other more hairy humans likely re-evolved body hair because they are adapted to cold climates in ice age Europe and Asia. The increased amount of body hair comes at a price, as it is achieved by increasing the level of DHT in the body. DHT is a male hormone that stimulates hair growth but it also shrinks the hair follicle over long periods of time, so Europeans and some Asians often become prematurely bald. Premature baldness is rare among African males and their descendants. In fact higher levels of DHT often cause some European women to have excess facial and body hair (mostly in the legs and arms but not in the chest) and they also often suffer from fertility problems as the DHT may interfere with their reproductive organs,.
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