Question

Paraphrase the following passage:


Chipmunks recently challenged the scientific dogma that small mammals were forced south during the Ice Age 18,000 years ago. DNA samples from more than 200 chipmunks in Illinois and Wisconsin were used to construct a family tree showing that chipmunks migrated further south only after glaciers receded. Scientists determined the chipmunks’ migration routes by analyzing mutations in their genes. The longer a group of animals remains in one place, the more mutations they accumulate, increasing their genetic diversity. Animals leaving the refuge for a new area take only a few of the changes, and, therefore, the new group has less variety in its genes. The chipmunk populations found in the south had fewer mutations than those in northern Illinois and Wisconsin.


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Answer 1

Answer:

During the Ice Age 18,000 years ago, chipmunks recently challenged the scientific dogma that small mammals were forced south. Scientists found DNA samples from more than 200 chipmunks in Illinois and Wisconsin and used those to develop a family tree that exhibits how chipmunks have migrated further south only after the glaciers receded. They discovered the migration routes the chipmunks took. How did they do this? They analyzed the mutations in the animal's genes. The longer a gather of creatures remains in one put, the more mutations they develop, expanding their hereditary differences. The scientists saw that animals leaving the place for a new area take only a few of the changes, and, therefore, the new group has less variety in its genes. In northern Illinois and Wisconsin, the chipmunk populations found more mutations than those in the south.

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