In the 1970s researchers picked up from Dawrins Galapagos finch studies. Over a 10 year period, one particular island received less rain, and the seeds become larger and harder to crack. Upon measuring the beaks of one species of finch on the island, they discovered that the average beak size in in the population had increased, likely to better crack the larger seeds. This is an example of:

EVOLUTION

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

In the 1970’s researchers picked up from Dawrin’s Galapagos finch studies. Over a 10 year period, one particular island received less rain, and the seeds become larger and harder to crack. Upon measuring the beaks of one species of finch on the island, they discovered that the average beak size in in the population had increased, likely to better crack the larger seeds. This is an example of:

A	Variation
B	Adaptation
C	Overproduction
D	Descent with modification

Explanation:

Detailed explanation-1: -Later, Darwin concluded that several birds from one species of finch had probably been blown by storm or otherwise separated to each of the islands from one island or from the mainland. The finches had to adapt to their new environments and food sources. They gradually evolved into different species.

Detailed explanation-2: -Darwin observed the Galapagos finches had a graded series of beak sizes and shapes and predicted these species were modified from one original mainland species.

Detailed explanation-3: -They found the offsprings’ beaks to be 3 to 4% larger than their grandparents’. The Grants had documented natural selection in action. While beak size is clearly related to feeding strategies, it is also related to reproduction. Female finches tend to mate with males that have the same size beaks.

Detailed explanation-4: -They discovered that, in choosing a mate, female Galápagos finches discriminate between males on the basis of their songs. Both the song itself and the preference for a particular song are passed from parent to offspring through learning.

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LIFE SCIENCE

OBJECTIVE LIFE SCIENCE

EVOLUTION