Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Chapter 18.6, Problem 2CC
Summary Introduction
To explain:
Why flies and mice are so different, even though the DNA sequences called home boxes are common.
Introduction:
The genes that regulate the structural development in many plants, echinoderms, insects and mammals are known as homeotic genes. The regulation of homeotic genes is done through transcription factors programming and these transcriptional factors affect the homeotic genes via genetic regulatory pathways.
Mutations in these genes result in displacement of the body parts. For example, antennae displaced in the posterior part of the fly instead the head portion. The homeotic genes are mainly of two types: ParaHox and Hox which play important role in segmentation.
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The MyoD gene in mammals plays a role in skeletal muscle-cell differentiation, whereas the Hox genes are homeotic genes that play a role in the differentiation of particular regions of the body. Explain how the functions of these genes are similar and different.
Which statement about Hox genes is false?
a.
They are expressed in similar patterns in the embryos of both mice and flies.
b.
They include a conserved region of base pairs called the homeobox.
c.
They are arranged in similar clusters of genes in both mice and flies.
d.
They are part of the so-called genetic toolkit.
e.
Because of their important functional roles, they evolved rapidly in both mammals and flies.
Expression of a homeotic gene in the wrong tissue in Drosophila results in the development of an
inappropriate body part from that tissue. Explain why this happens and how it shows that homeotic
genes are positive regulators of developmental pathways.
Chapter 18 Solutions
Campbell Biology in Focus
Ch. 18.1 - Prob. 1CCCh. 18.2 - Prob. 1CCCh. 18.2 - Explain the advantage of the systems biology...Ch. 18.2 - Prob. 3CCCh. 18.3 - The best estimate is that the human genome...Ch. 18.3 - Prob. 2CCCh. 18.3 - Prob. 3CCCh. 18.4 - Discuss the characteristics of mammalian genomes...Ch. 18.4 - Which of the three mechanisms described in Figures...Ch. 18.4 - Prob. 3CC
Ch. 18.5 - Describe three examples of errors in cellular...Ch. 18.5 - Prob. 2CCCh. 18.5 - Prob. 3CCCh. 18.6 - Would you expect the genome of the macaque (a...Ch. 18.6 - Prob. 2CCCh. 18 - Prob. 1TYUCh. 18 - Prob. 2TYUCh. 18 - Two eukaryotic proteins have one domain in common...Ch. 18 - DRAW IT Comparing amino acid sequences of similar...Ch. 18 - SCIENTIFIC INQUIRY The scientists mapping human...Ch. 18 - FOCUS ON EVOLUTION Genes important in the...Ch. 18 - FOCUS ON INFORMATION The continuity of life is...Ch. 18 - SYNTHESIZE YOUR KNOWLEDGE Insects have three...
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- Signal transduction pathways are important mechanisms for cell-to-cell communication in multicellular organisms. How do the target cells typically respond when they receive signals from neighboring cells during very early stages of embryo development? A. The target cells move to one of the poles to establish the anterior-posterior body axis. B. The target cells undergo changes in gene expression, sending them down a specific developmental path. C. The target cells stop dividing so the neighboring cells have time to get to the same stage of development. D. The target cells activate a collection of miRNAs to accelerate transcription and cell division.arrow_forwardScientists have cloned some animals by injecting a nucleus from an early embryo into an enucleated egg cell. Does this outcome demonstrate that genetic material is not lost during development? Why or why not?arrow_forwardWhy do mammalian embryos need both a maternal and a paternal genome?arrow_forward
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