Genetics: From Genes to Genomes
Genetics: From Genes to Genomes
6th Edition
ISBN: 9781259700903
Author: Leland Hartwell Dr., Michael L. Goldberg Professor Dr., Janice Fischer, Leroy Hood Dr.
Publisher: McGraw-Hill Education
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Chapter 19, Problem 9P

Sevenless is an unusual receptor protein in that it is required only in one nonessential cell type—R7 precursor cells. That is, sev− flies (null mutants) lack R7 cells in their eyes, yet they are fully viable and fertile under laboratory conditions. In contrast, the epidermal growth factor receptor (EGFR) is required in a variety of cell types beginning early in development. Because of the pleiotropic function of EGFR, flies that lack this protein die during embryogenesis.

a. The Ras/MAPK pathway that relays the Sevenless signal to the nucleus (Fig. 19.6) also operates downstream of EGFR. Explain why the screen for modifiers of sev mutations used to identify components of the Ras/MAPK pathway (Fig. 19.5) would not have worked with Egfr mutations
b. Design a modifier screen that would identify mutations in genes in the Egfr pathway. (Hint: Use a transgene.)
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Chapter 19 Solutions

Genetics: From Genes to Genomes

Ch. 19 - Drosophila researchers have collected many strains...Ch. 19 - As an alternative to random mutagenesis,...Ch. 19 - A C. elegans nematode gene called par-1 helps to...Ch. 19 - The molecular identity of the fruit fly rugose...Ch. 19 - To determine the focus of action of boss,...Ch. 19 - Suppose a particular gene is required for early...Ch. 19 - Researchers have exploited Minute mutations in...Ch. 19 - Some ts alleles are temperature sensitive during...Ch. 19 - The following figure shows the temperature-shift...Ch. 19 - A temperature-sensitive allele of the gene...Ch. 19 - Hypomorphic alleles of a pleiotropic gene...Ch. 19 - In addition to the maternal effect genes that...Ch. 19 - The yan gene encodes a transcription factor that...Ch. 19 - Recall from Chapter 17 that in Drosophila, sex...Ch. 19 - a. Explain the difference between maternal...Ch. 19 - In the 1920s, Arthur Boycott, working with the...Ch. 19 - The Drosophila mutant screen shown on the...Ch. 19 - Some genes are required both zygotically and...Ch. 19 - How would a human with a mutation in a maternal...Ch. 19 - One important demonstration that Bicoid is an...Ch. 19 - The hunchback gene contains a 5 transcriptional...Ch. 19 - In flies developing from eggs laid by a...Ch. 19 - Wild-type embryos and mutant embryos lacking the...Ch. 19 - The Drosophila even-skipped eve gene has four...Ch. 19 - In Drosophila with loss-of-function mutations...Ch. 19 - It is crucial to the development of Drosophila...Ch. 19 - In the plant Arabidopsis thaliana, every flower is...
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