Biology (11th Edition)

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

Chapter 51 - The Immune System - Figure 51.17 - Inquiry Question: 1

Answer

A common structure of these two proteins and the B and T lymphocytes which have them evolved from one common ancestral cell and protein.

Work Step by Step

Probably some ancestral animal had a simpler immune system with one kind of lymphocyte and one kind of functional protein which, over time, diversified into more complex systems in taxa descended from it.
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