At the beginning of the Paleozoic era, animals underwent an adaptive radiation event, called the Cambrian explosion. During this relatively short span of geological time, the ancestors of most animal phyla arose. Classification of taxa at the rank of phylum is based largely on body plan, which is laid out during embryonic development. Answer the questions that follow: What environmental condition may have contributed to the Cambrian explosion? What is one evolutionary novelty (phenotypic trait) that also contributed to the Cambrian explosion? Genetic and developmental mechanisms also contributed to the Cambrian explosion. Before the Cambrian, animals were small with simple body plans (g., sponges and jellyfish). By the end of the period, larger animals with complex body forms had evolved (e.g., arthropods and vertebrates). Did the following genetic mechanisms impact the evolution of body plan complexity? Provide a brief explanation for each answer. gene duplication eventshomeotic gene expression

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Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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At the beginning of the Paleozoic era, animals underwent an adaptive radiation event, called the Cambrian explosion. During this relatively short span of geological time, the ancestors of most animal phyla arose. Classification of taxa at the rank of phylum is based largely on body plan, which is laid out during embryonic development. Answer the questions that follow:

What environmental condition may have contributed to the Cambrian explosion?

What is one evolutionary novelty (phenotypic trait) that also contributed to the Cambrian explosion?

Genetic and developmental mechanisms also contributed to the Cambrian explosion. Before the Cambrian, animals were small with simple body plans (g., sponges and jellyfish). By the end of the period, larger animals with complex body forms had evolved (e.g., arthropods and vertebrates). Did the following genetic mechanisms impact the evolution of body plan complexity? Provide a brief explanation for each answer.

gene duplication events
homeotic gene expression

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