Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 19 - Genes, Development, and Evolution - 19.4 - Changes in Gene Expression Underlie the Evolution of Development - 19.4 Recap - Learning Outcomes - Page 419: 2

Answer

Organ identity genes code for proteins that work in combination to produce particular whorl features. • Class A genes are expressed in whorls 1 and 2 (forming sepals and petals) • Class B genes are expressed in whorls 2 and 3 (forming petals and stamens) • Class C genes are expressed in whorls 3 and 4 (forming stamens and carpels)

Work Step by Step

Organ identity genes code for proteins that work in combination to produce particular whorl features. • Class A genes are expressed in whorls 1 and 2 (forming sepals and petals) • Class B genes are expressed in whorls 2 and 3 (forming petals and stamens) • Class C genes are expressed in whorls 3 and 4 (forming stamens and carpels)
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