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Sexual Selection In Charles Darwin's The Descent Of Man

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Sexual selection is a theory that Charles Darwin discussed in his book, The Descent of Man. The theory is that animals evolve certain traits over time, such as striking ornaments on a ram, to compete with other members of the same sex to be selected by the opposite sex for the purpose of mating. Some animals evolve and gain a physiological difference than the opposite sex, this phenomena is called sexual dimorphism. . Some animals have small differences such as beasts on a female human and some traits are more prominent. animal with clear sexual dimorphic differences are peacocks. Male peacocks have large colorful feathers not found on female peacocks, these feathers are vital to this species in being selected to mate. Mutual attraction is …show more content…

Frogs have two inner ear organs to hear these calls, the amphibian papilla and the basilar papilla. The more sensitive of the two papillae is the basilar papilla, which has a frequency sensitivity of 2130 Hz. The male chuck that is closest to this tuning is the one that will attract females the most effectively. What scientists want to understand is: if the male chuck is a result of the ear tuning or if the tuning of the ear is a reflection of the chuck. In order to truly understand which trait is a product of evolution from the other trait; biologists first looked at tuning of ears in similar species to the tungara frogs. Biologists found that “females of related species have similar tuning of this inner ear organ. Only a few members of the Physalaemus species group, however produce call suffixes that excite this inner ear organ” (Page Bernal R979). This fact alone points in the direction that it is improbable that the tuning of the basilar papilla is a result of the male tungula mating call, but rather the call is a result of the female tungula’s ear tuning. The fibrous mass in the larynx of male tangula frogs is a sexually dimorphic evolutionary trait that is the result of tuning in female’s ear. This study suggests that the female’s inclination to that sound was prominent before the male’s chuck ever

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When Glass Frogs mate they do it after a rainy season or on a day that is foggy and rainy, They only mate in trees and not on the ground. When they are on the ground they are either meeting with a mate or the female is calling for a mate in a loud croaky sound, After a female has found a mate they then head to the tree to continue the circle of life. (Soft Schools). When mating season comes they only mate at night and the male glass frog chooses the site to mate in the tree, Female is the one who calls for the male to mate with later on. Once they are up in the tree and begin to start amplexing together they can take up to twenty to thirty hours together amplexing in the tree, after that process the to develope the tadpoles can take up to two to three weeks.

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The bull frog has a long and fast tongue to catch their prey with. The bull frog is well populated I would say due to how many eggs they lay. The skin type is permeable. The craziest thing I have ever heard is that a bull frog can lay around 20,000 eggs, which is a lot of eggs which all them eggs float together.

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Some of the places that should be observed are rocky areas; especially between the rocks, under piles of leaves and in the muddy areas around ponds and lakes. It would be difficult to observe which frogs are swimming down at the bottom of the ponds and lakes because they would probably be frozen over. This is why this experiment would be the harder of the

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Its native range extends from the central and eastern United States up into Southern Canada. But the frogs are now found from Nova Scotia to Central Florida, from the East coast of the U.S. to Wisconsin, across the Great Plains to the Rockies, as far west as California and Mexico, and even places like Hawaii, the Caribbean, South America, Europe and Asia. It appears the species was introduced from its original habitat in North America in the early 1900s in Colorado and California and the introduction appears to have been accidental. Evidence suggests the frogs could have been introduced through trout streams and lakes during the Colorado Divisions of Wildlife fish stocking operations in the early 1900s, as bullfrogs have been known to invade fish hatchery ponds and leave their larvae to be stocked into ponds along with the

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I was there. I was ready. The frog sat peacefully in the spring grass, oblivious to our trap. He was awe-inspiring; his legs looked like they could break a board with one kick, and his body was streamlined for expert navigation in cold muddy waters. His silhouette was dignified, and he held his held high to survey his murky, wet homeland.

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The criteria for mate choice can be initially given by humans and will certainly be different from humans’ criteria in sexual selection.

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