Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 20.2, Problem 2CS
Development in Animals I: Pattern Formation
Core Skill: Connections Look ahead to Figure 24.15. How is the number of Hox genes related to the complexity of animal bodies?
Figure 24.15 Hox gene number and body complexity in different types of animals. Researchers speculate that the duplication of Hox genes and Hox gene clusters played a key role in the evolution of more complex body patterns in animals. A correlation is observed between increasing numbers of Hox genes and increasing complexity of body patterns. The Hox genes are divided into four groups, called anterior, group 3, central, and posterior, based on their relative similarities. Each group is represented with a different color in this figure.
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Q113: Write a short answer for each question.
• Expensive Tissue Hypothesis is an important concept that accounts for which major morphological change in the hominin family tree?
• What major selective pressures and resource niches are hypothesized to have led to these changes?
Be sure to include specific species and their morphological features that support this hypothesis.
Note: no copy, no plagiarism write your own words.
Development of an animal is controlled by the genes that are expressed during development. What roles have been proposed for Hox genes in the evolution and morphology of animal species?
Group of answer choices
1. Variation in the Hox genes may have spawned the formation of many new body plans.
2. All of these descriptions are correct.
3. The number and arrangement of Hox genes varies among different types of animals.
4. Increases in the number of Hox genes may have led to greater complexity in body structure.
Species
Embryo (A-F)
Describe the Anatomical
Changes from Early to Late
Stages
Human
Chicken
Rabbit
Tortoise
Salamander
В
Fish
A
Guide Questions:
1. Look again at the six embryos in their earliest stages. Describe the patterns you see. What physical
similarities exist between each of the embryos?
2. Does this suggest an evolutionary relationship? Explain how these embryos can be used as evidence of
a common ancestor between each of these six organisms.
Chapter 20 Solutions
Biology
Ch. 20.1 - 20.1 General Themes in Development Concept Check:...Ch. 20.1 - Prob. 2CCCh. 20.1 - Prob. 1CSCh. 20.2 - Development in Animals I: Pattern Formation...Ch. 20.2 - Development in Animals I: Pattern Formation...Ch. 20.2 - Prob. 3CCCh. 20.2 - Core Skill: Modeling The goal of this modeling...Ch. 20.2 - Development in Animals I: Pattern Formation Core...Ch. 20.3 - Development in Animals II: Cell Differentiation...Ch. 20.3 - Development in Animals II: Cell Differentiation...
Ch. 20.3 - Development in Animals II: Cell Differentiation...Ch. 20.3 - Development in Animals II: Cell Differentiation...Ch. 20.3 - Development in Animals II: Cell Differentiation...Ch. 20.4 - Development in Plants Concept Check: Where are...Ch. 20.4 - Prob. 2CCCh. 20 - The process whereby a cells morphology and...Ch. 20 - Prob. 2TYCh. 20 - Positional information is important in determining...Ch. 20 - Morphogens are a. molecules that disrupt normal...Ch. 20 - Prob. 5TYCh. 20 - Arrange the following phases of pattern formation...Ch. 20 - Prob. 7TYCh. 20 - Which of the following genes do not play a role in...Ch. 20 - An embryonic stem cell that can give rise to any...Ch. 20 - Prob. 10TYCh. 20 - Prob. 1CQCh. 20 - The MyoD gene in mammals plays a role in muscle...Ch. 20 - Prob. 3CQCh. 20 - Prob. 1COQCh. 20 - Is it possible for a phenotypically normal female...
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