Answer
D. 2x.
Work Step by Step
The cell at metaphase I has duplicated DNA-- a 4n content --so if 2n = x, then 4n = 2x.
Campbell Biology (10th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Published by
Pearson
ISBN 10:
0321775651
ISBN 13:
978-0-32177-565-8
Chapter 13 - Test Your Understanding - Level 2 - Application/Analysis - Page 266: 4
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