Which one of the three possible results of natural selection does this experiment demonstrate and what was the most powerful selective pressure; camouflage or mates? For thousands of years, humans have been influencing evolution, through changes we have caused in theenvironment – and through artificial selection in the domestication of plants and animals. In many cases,scientists have carefully documented evolution through artificial selection in the lab.The spots on guppies can be manipulatedthrough artificial selection.John Endler performed experiments in microevolution, allowing artificial selection to manipulate the spots onguppies. Guppy spots are largely genetically controlled. Spots that help the guppy blend in with itssurroundings protect it from predation - but spots that make it stand out help it attract mates. Endler set upsimilar populations of guppies in artificial ponds in the laboratory. Ponds varied in the coarseness of gravel onthe bottom and all ponds had predators. Below is a simplified representation of Endler's experiment.Initial set-up:course gravel, predator presentfine gravel, predator presentfewer than 15generations of selectionfewer than 15generations of selectionAfter fewer than 15 generations of selection, the markings of guppies in different ponds had substantiallydiverged as a result of natural selection. In the presence of predators, guppies evolved to blend in with theirbackground.Endler then performed another experiment, with the same pond set-ups but without predators. Initial set-up:course gravel, no predatorfine gravel, no predatorfewer than 15fewer than 15generations of selectiongenerations of selectionDownload the two graphics above from the Image library.Without predators, there was sexual selection for male guppies that stood out from their background andattracted the attention of the females.View thie article opline at

If a character is fittest to the nature then the species is better survive in the environment,…

Answered: Which one of the three possible results…

Which one of the three possible results of natural selection does this experiment demonstrate and what was the most powerful selective pressure; camouflage or mates?

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter12: Processes Of Evolution

Section: Chapter Questions

Problem 1FIO

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