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: 1



Work Step by Step

A karyotype is a picture of the diploid complement of chromosomes of a cell that shows homologous chromosomes paired together in order of decreasing size. Because the karyotype shows the chromosomes and their numbers, only a defect in chromosome number would appear in a karyotype. Options A, C, and D are incorrect because these are conditions that are not caused by defects in the number of chromosomes. Option B is correct because in trisomy 21, we can clearly see that there are three copies of chromosome 21 in the karyotype.
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