Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 14, Human Heredity - Standardized Test Prep - Page 415: 2



Work Step by Step

Nondisjunction of the X chromosomes in the mother leads to one egg receiving no X chromosome. Therefore, when an egg cell with no X chromosome joins with a sperm cell with a normal X chromosome, the resulting embryo is a female with a single X chromosome. Options A, C, and D are conditions resulting from defective copies of genes and are not a defect in the number of chromosomes resulting from nondisjunction.
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