Campbell Biology (11th Edition)

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

Chapter 15 - 15.4 - Concept Check - Page 309: 1

Answer

The gonadal translocation would end up in an egg or sperm which fused with a gamete of the opposite type to produce the child with Down syndrome. These joined chromosomes act as a single one and join to the other gamete's normal chromosome 21, resulting in three such chromosomes in the child (hence the name trisomy 21).

Work Step by Step

This is a second way to produce the gamete with an extra copy of chromosome 21. The more common cause of Down syndrome is nondisjunction during meiosis which creates one gamete missing chromosome 21 and another with a third attached copy.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.