Test: Common Core: 6th Grade English Language Arts

Text 1:

Genetic investigations into the origins of human life most often focus on mitochondrial DNA. As opposed to nuclear DNA, mitochondrial DNA is transmitted only from the mother. This allows for the tracing of mutations that arise independently of changes that occur because of the combining of the mother’s and father’s DNA. As useful as this is, the high mutation rate of mitochondrial DNA allows scientists to look at only relatively recent prehistory. 

Text 2:

Nuclear DNA, on the other hand, has a low mutation rate, making it ideal for looking into the more distant past. Studying the nuclear DNA of fossils now shows a substantial decrease in population size in Europe and Asia approximately 50-80 thousand years ago. No such decrease happened in Africa. This supports the idea that migrants from Africa replaced all previous humans, and did not interbreed with earlier migrants.

 

1.

Which of the following describes the claims made in the two texts?

The two authors express views that directly contradict each other.

The two authors express different views that are compatible with each other.

The two authors express views that directly contradict each other.

The two authors express views that directly contradict each other.

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