Genetic Analysis: An Integrated Approach (2nd Edition)
2nd Edition
ISBN: 9780321948908
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 20, Problem 15P
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You are interested in studying position effect variegation in Drosophila using the chromosome depicted below:
Deactivation of the w+ gene gives a white eye phenotype and deactivation of the rst+ gene gives a rough eye
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close to a heterochromatic domain, some sections (or sectors) of the eye display mutant phenotypes due to gene
deactivation while others display the normal, wild type phenotype. Which phenotype would you not expect to see
rst w
Inverted X chromosome
white smooth eye sectors
white rough eye sectors
red smooth eye sectors
red rough eye sectors
You have identified a Drosophila gene that is expressed exclusively in the odd-numbered "stripes" in the cellular blastoderm. Assuming that this gene is not redundant, what
would be the most likely phenotype cause by a loss-of-function mutation in this gene?
an embryo missing odd numbered segments
an adult fly with a second pair of wings instead of halteres
an embryo with two anterior ends
an embryo missing even-numbered segments
an embryo missing larval segments 3-10
Here are schematic diagrams of mutant Drosophila larvae.
The left side of each pair shows a wild-type larva, with gray boxes showing the sections that are missing in the mutant larva. Which type of gene is defective in each larva: a gap gene, a pair-rule gene, or a segment-polarity gene?
Chapter 20 Solutions
Genetic Analysis: An Integrated Approach (2nd Edition)
Ch. 20 - 18.1 Explain why many developmental genes encode...Ch. 20 - Bird beaks develop from an embryonic group of...Ch. 20 - 18.3 How is positional information provided along...Ch. 20 - Early development in Drosophila is atypical in...Ch. 20 - 18.5 Consider the evenskipped regulatory sequences...Ch. 20 - What is the difference between a parasegment and...Ch. 20 - Why do loss-of-function mutations in Hox genes...Ch. 20 - 18.8 Compare and contrast the specification of...Ch. 20 - Prob. 9PCh. 20 - Ablation of the anchor cell in wild type C....
Ch. 20 - 18.11 In gain-of-function and. elegans mutants,...Ch. 20 - Prob. 12PCh. 20 - Prob. 13PCh. 20 - 18.14 Given that maternal Bicoid activates the...Ch. 20 - What phenotypes do you expect in flies homozygous...Ch. 20 - The pair rule gene fushitarazu is expressed in...Ch. 20 - 18.17 In contrast to Drosophila, some insects...Ch. 20 - Prob. 18PCh. 20 - 18.19 You are traveling in the Netherlands and...Ch. 20 - 19.20 A powerful approach to identifying genes of...Ch. 20 - Prob. 21PCh. 20 - The Hoxd 913 genes are thought to specify digit...Ch. 20 - Three-spined stickleback fish live in lakes formed...Ch. 20 - In C. elegans there are two sexes: hermaphrodite...Ch. 20 - The flowering jungle plant Lacandoniaschismatica,...Ch. 20 - 18.24 Homeotic genes are thought to regulate each...Ch. 20 - Prob. 27PCh. 20 - Basidiomycota is a monophyletic group of fungi...Ch. 20 - In Drosophila, recessive mutations in the...
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