Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 15 - Test Your Understanding - Level 3 - Synthesis/Evaluation - Page 313: 14


The butterfly began as a male XX zygote, but nondisjunction in the first cell division gave rise to the other side of the body with a single X chromosome. This side was, therefore, female, leaving the right side with XX chromosomes and, therefore, male.

Work Step by Step

Review the material on nondisjunction, and see that the question contains a hint in its description of the butterfly sex chromosome system.
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