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The forelimbs of cetaceans, pinnipeds, and sirenians presents a classic example of convergent evolution. There is widespread convergence at the gene level. [19] Distinct substitutions in common genes created various aquatic adaptations, most of which constitute parallel evolution because the substitutions in question are not unique to those ...
A common example of homologous structures is the forelimbs of vertebrates, where the wings of bats and birds, the arms of primates, the front flippers of whales, and the forelegs of four-legged vertebrates like horses and crocodilians are all derived from the same ancestral tetrapod structure.
The flipper forelimbs of marine mammals (cetaceans, pinnipeds, and sirenians) are a classic example of convergent evolution. There is widespread convergence at the gene level. [ 6 ] Distinct substitutions in common genes created various aquatic adaptations, most of which also constitute parallel evolution because the substitutions in question ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 20 January 2025. Taxonomic group of semi-aquatic mammals Pinnipeds Temporal range: Latest Oligocene – Holocene, 24–0 Ma Pre๊ ๊ O S D C P T J K Pg N Clockwise from top left: Grey seal (Halichoerus grypus), Steller sea lion (Eumetopias jubatus), New Zealand fur seal (Arctocephalus forsteri), walrus ...
Hypercarnivory became increasingly less common while braincases enlarged and forelimbs became ... for example, may have in common ... Visual communication among birds ...
For example, if one chimpanzee sees a snake, said chimpanzee may make a low, rumbling noise, signaling for all the other chimps to climb into nearby trees. [11] In this case, the chimpanzees' communication does not indicate displacement, as it is entirely contained to an observable event.
They have become superficially different and unrelated structures to serve different functions in adaptation to different environments and modes of life. This phenomenon is shown in the forelimbs of mammals. For example: In monkeys, the forelimbs are much elongated, forming a grasping hand used for climbing and swinging among trees.
For example, the darter characine has a ZW multifactorial system where the female is determined by ZW 1 W 2 and the male by ZZ. The wolf fish has a XY multifactorial system where females are determined by X 1 X 1 X 2 X 2 and the male by X 1 X 2 Y. [ 82 ] Some teleosts, such as zebrafish , have a polyfactorial system, where there are several ...