Essentials of Genetics (9th Edition) - Standalone book
9th Edition
ISBN: 9780134047799
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Chapter 20, Problem 5PDQ
(a) What are maternal-effect genes? (b) When are gene products from these genes made, and where are they located? (c) What aspects of development do maternal-effect genes control? (d) What is the
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Chapter 20 Solutions
Essentials of Genetics (9th Edition) - Standalone book
Ch. 20 -
CASE STUDY |One foot or another
In humans the...Ch. 20 - CASE STUDY| One foot or another In humans the HOXD...Ch. 20 - CASE STUDY| One foot or another In humans the HOXD...Ch. 20 - HOW DO WE KNOW? In this chapter, we have focused...Ch. 20 - Review the Chapter Concepts list on page 403. Most...Ch. 20 -
3. Nuclei from almost any source may be injected...Ch. 20 -
4. Distinguish between the syncytial blastoderm...Ch. 20 - (a) What are maternal-effect genes? (b) When are...Ch. 20 - (a) What are zygotic genes, and when are their...Ch. 20 - List the main classes of zygotic genes. What is...
Ch. 20 -
8. Experiments have shown that any nuclei placed...Ch. 20 - How can you determine whether a particular gene is...Ch. 20 -
10. You observe that a particular gene is being...Ch. 20 - What are Hox genes? What properties do they have...Ch. 20 -
12. The homeotic mutation Antennapedia causes...Ch. 20 - The Drosophila homeotic mutation spineless...Ch. 20 - A number of genes that control expression of Hox...Ch. 20 - In Arabidopsis, flower development is controlled...Ch. 20 - Prob. 16PDQCh. 20 - Dominguez et al. (2004) suggest that by studying...
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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?arrow_forwardAt which stage of development does the Id protein function? Why is its function important?arrow_forwardThe anterior–posterior axis of a Drosophila embryo is first established by certain (a) homeotic genes (b) maternal effect genes (c) segmentation genes (d) proto-oncogenes (e) pair–rule genesarrow_forward
- What are some master genes important in embryonic development?arrow_forwardZygote Embryo Muscle cells Intestinal cells Liver cells Blood cells Nerve cell Cardiac cells (1) Specialization occurs, resulting in the formation of a great variety of cell types. (2) Genes are inserted into the zygote to allow for the formation of different cell types. (3) The expression of genes responsible for the different cell types is controlled by the placenta. (4) The genetic information in the zygote is divided to produce a complete set for each cell typearrow_forwardIf an AaBbCcdd male mates with an AaBbCCDd female: A) What is the minimum number of ridge-producing genes possible in one of their children? B) What would the be the TRC for this child if it is a male? C) If this child is a male, will he have a higher or lower TRC than the parent with the lower ridge count?arrow_forward
- What causes most of the phenotypic abnormalities in someone with Down's Syndrome? A) They have many gene mutations that produce nonfunctional proteins. B) They express too much of some proteins during development. C) Their cells cannot go through mitosis properly during development because they have an odd number of chromosomes. D) Their chromosomes cannot pair during meiosis.arrow_forwardGradients of morphogens can be preestablished in the oocyte. Also, later in development, morphogens can be secreted from cells. How are these two processes similar and different?arrow_forwardAt which stage of development does XCI initially occur?arrow_forward
- What is true of the Progress Zone model? a) the length of time a cell resides in the progress zone dictates its identity along the proximodistal axis b) it is consistent with the outcome of removing the AER at successively later stages of limb development c) once a cell leaves the progress zone, its identity is established along the proximodistal axis d) cells of the progress zone are stimulated to divide by the AER e) all of the above You isolate a new mutant chicken strain in which limb outgrowth is severely curtailed. Limbdevelopment begins and the AER initially forms, but the AER then degenerates and subsequent development of the limb is aborted. Which of the following is a possible explanation for the AER phenotype? a) the mutant gene may function cell autonomously in the AER b) the mutant gene may function cell-nonautonomously in the limb bud mesenchyme c) the mutant gene may interfere with the feedback loop between the mesenchyme and AER d) all of the abovearrow_forwardFor 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?arrow_forwardIf an AaBbCcdd male mates with an AaBbCCDd female: A) What is the minimum number of ridge-producing genes possible in one of their children? B) What would the be the TRC for this child if it is a male? C) If this child is a male, will he have a higher or lower TRC than the parent with the lower ridge count? D) What is the maximum number of ridge-producing genes possible in a child of this couple? E) If this child is a female, will she have a higher or lower TRC than the parent with the higher ridge count?arrow_forward
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