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What accounts for the variation Darwin observed among island species?
Wiki User
∙ 8y ago
Based on the study by Abzhanov et al. (Bmp4 and Morphological Variation of Beaks in Darwin's Finches. Science 2004 ), the differences in beak shape is partly determined by the expression of a signaling factor (Bmp4). Finches that have larger and broader beaks were shown to express Bmp4 earlier in development and at higher levels. Finches with different shaped beaks were able to exploit different food sources and this allowed the many beak shapes to remain present. After hundreds (or thousands) of years, the birds diverged and became different species.
Wiki User
∙ 15y ago
Wiki User
∙ 8y agoHe observed differences among the island species.
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What were Darwin's observations?
•The overall observations he made were Survival of the Fittest. He observed the finches beaks from the mainland and from the islands. He realized that finches were all the same species, however they adapted in their own special way.
What did Charles Darwin's Origin of Species justify?
what did Charles Darwin's origin of species justify and hi
What did Darwin assert in his book On The Origin of Species as the mechanism of evolution?
Due to genes and mutations, organisms show variation within a species. Changes in the environment can put a selective pressure on the species - certain mutations may be more beneficial, therefore more individuals with that mutation will exist, as they survive and breed. This process is called Natural Selection.
Why is variation important to survival of a species?
Hats off to Sir Charles Darwin for his theory of evolution! Variations are very important to species. Some of the variations are more suitable for the species to survive. You get new species with time by selection of the better ones.
How is natural selection used in artificial selection?
Natural variation in artificial selection is used because humans choose from among the naturally occurring variation s in species. Natural selection is related to species fitness because Darwin called natural selection survival of the fittest because those that could survive would carry their species on there for being the naturally selected.
Charles Darwin observed that instead of being perfect and unchanging individuals in a species show what?
variation!
What are the islands where Charles Darwin observed variation among organisms?
Galapagos Islands are the islands where Charles Darwin observed variation among organisms.
What is one example of biological variation that Darwin observed in his travels?
plant
Who observed variation in the characteristics of animals and plants on the different islands of Galapagos?
Charles Darwin
What did Darwin observe?
British Naturalist Charles Darwin visited Galapagos Islands in 1835. During his visit he observed that difference species were in a constant battle of survival with each other, and there was a variation in between tortoise on the sand and those in the water.
What does it mean when Darwin saw that variation exists within a species?
When studying and proving the theory of evolution, Darwin notice that variations existed within species. Species includes organisms that are closely related and can mate to produce fertile offspring. Variation is a difference. Darwin noticed that there were more than one organism inside a species.
Island where Darwin observed variation in tortoises?
While Charles Darwin was in Galapagos, he visited the islands of Floreana, Isabela, San Cristóbal, and Santiago only.
How do linnaeus and Darwin differ?
Linnaeus retained typological thinking of human variation. Basically, Linnaeus want to diverge a species into several types (perhaps sub species) while Darwin focuses on variation. Linnaeus wants to divide human by types while Darwin says there is no type in human. He emphasis on variation among species.
Darwin observed that some finches had larger beaks than other finches in the population on the Galpagos Islands What does this observation illustrate?
Variation
The species of tortoises that Darwin found on the Galápagos Islands displayed different structural adaptations One of the adaptations that Darwin noted was the?
Variation in length of the tortoises' necks
What did Charles Darwin say about variation within species?
Because there is variation within a species, it is therefore possible for the law of natural selection to operate, by selecting those variations which best enhance survival and reproduction.
Why was variation the weakest concept in Darwin's theory?
Variation?!?! That was an obvious observation of naturalists that opposed Darwin's concepts totally. Unless you mean the heritability that leads to variation? Explaining that variation was the problem. Creationists of the time explained this by positing god's whimsy in designing his species, but this was shown to be nonsense as natural processes are at work in variation and this can be shown experimentally. The concept of natural selection explained how that natural variation was selected on beneficial traits. What Darwin did not understand is how that variation was passed on to progeny. His explanation was wrong.
