Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 35 - Deuterostomes - Figure 35.33 - Inquiry Questions: 2


This similarity can be explained by evolution: the placenta evolved from some egg structures to serve some of those same functions.

Work Step by Step

Review the purposes of placenta and the various membrane in an egg. Also review earlier material on development and genetics--you will see that it is relatively easy to turn one structure into another with a similar fuction by altering expression of a few genes.
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.