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Chapter 27: Q. 21 (page 722)

How have Hox genes contributed to the diversity of animal body plans?

Short Answer

Expert verified

Hox genes are activated by a series of regulatory genes, and the proteins they encode control the expression of later genes.

Step by step solution

01

Introduction

Hox genes are a subset of animal genes that specifically contain homeobox sequences. The general body plan of an animal, including the number of body segments, the number and location of appendages, and the direction of the animal's head and tail, are all determined by this gene cluster.

02

The explanation for the answer.

The morphology of the individual can significantly change as a result of altered homeotic gene expression. Organ and body component placement can be impacted by hox genes. A fruit fly's limb placement or the spacing between a person's fingers could be altered by a Hox gene mutation or duplication.

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Most popular questions from this chapter

Which of the following is not a feature common to most animals?

a. development into a fixed body plan

b. asexual reproduction

c. specialized tissues

d. heterotrophic nutrient sourcing

An animal whose development is marked by radial cleavage and enterocoely is ________.

a. a deuterostome

b. an annelid or mollusk

c. either an acoelomate or eucoelomate

d. none of the above

If a Hox 13 gene in a mouse was replaced with a Hox 1 gene, how might this alter animal development?

Describe at least two major changes to the animal phylogenetic tree that have come about due to molecular or genetic findings.

Plant life first appeared on land during which of the following periods?

a. Cambrian period

b. Ordovician period

c. Silurian period

d. Devonian period
See all solutions

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