EVOLUTION
SOURCES OF VARIATION IN A POPULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It was a defense against predators
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They originated from different types of species
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It is an adaptation to the food sources available
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The beak stretched to reach its food and was passed down
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Detailed explanation-1: -“The most exciting and significant finding was that genetic variation in the ALX1 gene is associated with variation in beak shape not only between species of Darwin’s finches but also among individuals of one of them, the medium ground finch, ” explained Leif Andersson, Ph.
Detailed explanation-2: -In particular, changes to the size and shape of the beaks have enabled the different species to specialise in different types of food: seeds, insects, cactus flowers and fruits or even bird blood. The Galápagos finches are a classic example of adaptive radiation.
Detailed explanation-3: -Answer and Explanation: Darwin’s finches are an example of speciation because they developed specialized beaks dependent on the type of food they ate, adapting to their food source and environment.
Detailed explanation-4: -Because the drought reduced the number of seeds and finches with bigger beaks were able to eat the larger and harder seeds so more of them survived.