Answer
C.
Work Step by Step
D is wrong since it produces much too little variation to explain the differences between these two proteins, A and B would produce more similarity than just the one exon mentioned.
Campbell Biology (11th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0-13409-341-0
ISBN 13:
978-0-13409-341-3
Chapter 21 - Test Your Understanding - Level 2 - Application/Analysis - Page 464: 3
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