Biology
4th Edition
ISBN: 9781259188121
Author: Peter Stiling, Robert Brooker, Linda Graham, Eric Widmaier
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 19.1, Problem 1CC
20.1 General Themes in Development
Concept Check: Which of these four responses do you expect to be more prevalent in the early stages of development, and which would become more prevalent in later stages?
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Discuss the role of homeotic genes in development. Explain what happens to the phenotype of a fruit fly when a gain-of-function mutation in a homeotic gene causes the protein to be expressed in an abnormal region of the embryo. What are the consequences of a loss-of-function mutation in such a gene?
Gene dosage—the number of copies of a gene that areactively being expressed—is important to proper development. Identify and describe two processes that establish the proper dosage of certain genes.
For genes that control pathways of development, loss-of-function mutations are usually recessive whereas gainof-function mutations are usually dominant. Can you suggest a reason why?
Chapter 19 Solutions
Biology
Ch. 19.1 - 20.1 General Themes in Development Concept Check:...Ch. 19.1 - Prob. 1BCCh. 19.1 - Prob. 2CCCh. 19.1 - Prob. 3CCCh. 19.1 - Prob. 2BCCh. 19.1 - Prob. 4CCCh. 19.2 - Development in Animals I: Pattern Formation...Ch. 19.2 - Development in Animals I: Pattern Formation...Ch. 19.2 - Prob. 3CCCh. 19.2 - Prob. 4CC
Ch. 19.2 - Development in Animals I: Pattern Formation Core...Ch. 19.2 - Development in Animals II: Cell Differentiation...Ch. 19.2 - Development in Animals II: Cell Differentiation...Ch. 19.2 - Development in Animals II: Cell Differentiation...Ch. 19.2 - Development in Animals II: Cell Differentiation...Ch. 19.2 - Development in Animals II: Cell Differentiation...Ch. 19.3 - Development in Plants Concept Check: Where are...Ch. 19.3 - Prob. 2CCCh. 19 - The process whereby a cells morphology and...Ch. 19 - Prob. 2TYCh. 19 - Positional information is important in determining...Ch. 19 - Morphogens are a. molecules that disrupt normal...Ch. 19 - Prob. 5TYCh. 19 - Arrange the following phases of pattern formation...Ch. 19 - Prob. 7TYCh. 19 - Prob. 8TYCh. 19 - An embryonic stem cell that can give rise to any...Ch. 19 - Prob. 10TYCh. 19 - Prob. 1CQCh. 19 - The MyoD gene in mammals plays a role in muscle...Ch. 19 - Prob. 3CQCh. 19 - Prob. 1COQCh. 19 - Is it possible for a phenotypically normal female...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Explain the role of axis formation in development.arrow_forwardAs shown in Figure 13-26, the Sonic hedgehog gene is expressed in many places in a developing chicken. Is theidentical Sonic hedgehog protein expressed in each tissue? If so, how do the tissues develop into different structures? If not, how are different Sonic hedgehog proteinsproduced?arrow_forwardExplain hoxA3 and HoxD3 genes are nearly equivalent yet they play distinct roles in the development of mouse.arrow_forward
- We know quite a bit about Notch/Delta and Hes gene oscillations during embryonic development. What do oscillations of these genes in the adult neural stem cell niche actually look like? How do these oscillations result in the progression from stem cell to neuron?arrow_forwardCompare and contrast how maternal-effect genes, gap genes, and homeotic genes affect Drosophila development.arrow_forwardDominguez et al. (2004) suggest that by studying genes that determine growth and tissue specification in the eye of Drosophila, much can be learned about human eye development. (a) What evidence suggests that genetic eye determinants in Drosophila are also found in humans? Include a discussion of orthologous genes in your answer. (b) What evidence indicates that the eyeless gene is part of a developmental network? (c) Are genetic networks likely to specify developmental processes in general? Explain fully and provide an example.arrow_forward
- In the introduction to this chapter, we discussed the role of famine during early prenatal development and how, through epigenetic effects, it influenced the health of individuals as adults. One effect that has been observed in people who were conceived during the Dutch Hunger Winter is that they suffer more cognitive decline later in life. If these individuals were autopsied after death, what differences might you expect to see in the chromatin of their brain cells? What do the mouse studies of cognition and epigenetic effects suggest?arrow_forwardWhat are the explanatory approaches to development? List down three approaches and give a situation where such approach was used in order to explain a phenomenon or concept in developmental biology.arrow_forwardYou isolate a glp-1 mutation of C. elegans and discoverthat the DNA region encoding the spatial control region(SCR) has been deleted. What will the GLP-1 protein expression pattern be in a four-cell embryo in mutant heterozygotes? In mutant homozygotes?arrow_forward
- What would be the most likely effect on development of puncturing the posterior end of a Drosophila egg, allowing a small amount of cytoplasm to leak out, and then injecting that cytoplasm into the anterior end of another egg?arrow_forwardTrue or false about the following statements on Drosophila eye development a. Hh, which is expressed by the developing photoreceptors in the posterior eye disc, induces cells in the morphogenetic furrow (MF) to express DPP, which is the ligand of DPP (BMP) signaling. b. Wg inhibits while Hh and DPP promote the expression of Eya in the preproneural (PPN) domain anterior to the MF, which is essential for the induction of photoreceptor differentiation and movement of MF from posterior to anterior. c. Eya (Eyes absent), sine oculis (so), Ey (Eyeless), and Eyg (Eygone) are the retinal determination (RD) network genes required for retinal determination and induction of atonal expression. d. EGFR signaling is required for the differentiation of all the photoreceptor neurons. In addition EGFR signaling is also required for maintaining cell survival in posterior eye discs. e. During Drosophila eye development, cell proliferation in the second mitotic wave is required to provide…arrow_forwardYes or no? Does contributing of molecules to study of development include methodogies to study gene expression and function? does rnai result permanently in gene expression!arrow_forward
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