ND STONY BROOK UNIVERSITY LOOSELEAF GENETICS: FROM GENES TO GENOMES
6th Edition
ISBN: 9781260406092
Author: HARTWELL, Leland, HOOD, Leroy, Goldberg, Michael
Publisher: Mcgraw-hill Education/stony Brook University
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Chapter 19, Problem 29P
How would a human with a mutation in a maternal effect gene most likely be recognized?
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How would a human with a mutation in a maternaleffect gene most likely be recognized?
You found a strain of mutant fruit flies (Drosophila) living on the rotten bananas in your dorm room. You notice that many of the larvae have abnormal abdominal segments. You want to know if the “abdomenless” mutation is a maternal effect gene. Describe an experiment you would do to determine this, and the results that would support and contradict the notion that the abdomenless gene encodes a maternal determinant.
What are the possible genotypes of the PTC locus?
Chapter 19 Solutions
ND STONY BROOK UNIVERSITY LOOSELEAF GENETICS: FROM GENES TO GENOMES
Ch. 19 - Match each of the terms in the left column to the...Ch. 19 - a. If you were interested in the role of a...Ch. 19 - Early C. elegans embryos display mosaic...Ch. 19 - Hypomorphic mutations in the wingless gene of...Ch. 19 - Prob. 5PCh. 19 - In 1932, H. J. Muller suggested a genetic test to...Ch. 19 - a. Explain how you could use worms transformed...Ch. 19 - Suppose you want to determine whether a particular...Ch. 19 - Sevenless is an unusual receptor protein in that...Ch. 19 - Suppose that you generated flies containing a...
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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- Describe the mechanism of genomic imprinting of the Igf2 gene in mammals.arrow_forwardWhy are mutations in the INK4 locus so dangerous?arrow_forwardWhy is it that mutations in bicoid and nanos exhibit genetic maternal effect in Drosophila (a mutation in the maternal parent produces a phenotype that shows up in the offspring), but mutations in runt and gooseberry do not?arrow_forward
- Explain one experimental strategy for determining the functional role of the mouse HoxD-3 gene.arrow_forwardDraw a basket mutant embryo. What does basket encode? Why do the mutant embryos have this phenotype?arrow_forwardHow are the genes in the beta-globin locus different from each other? A) They have different evolutionary origins, from different ancestral genes. B) They have different sequences and locations on the chromosome. (C) They are expressed at different times in developmnent. (D) Some are expressed in all cells; some are expressed only in red blood cells. E) They are dispersed on on different chromosomes.arrow_forward
- Which of the following is most influenced by the SRY gene?arrow_forwardWhat is the effect of the NDM gene?arrow_forwarda) Do the loss of function phenotypes differ between the genes between the genes in figure 1? What does this mean? b) What are the two cell types responsible for producing maternal gene products involved in terminal patterning in the Drosophila cocyte? In which of these two cell types is each of the three genes expressed? c) Based on the phenotypes you observed for the three genes, and on the differences in their expression patterns, which one of the genes do you think is the localised determinant of terminal patterning? d❘ From the gain-of-function experiments, do trunk and torso like work upstream or downstream of torso? Explain. (4 m e) How might you test which of the trunk and torso-like genes acts upstream of the other? f) The torso gene has been shown to have another important role in Drosophila development outside of terminal patterning. What do you think would be a good first experiment to do to begin to investigate possible other roles for the trunk or torso - like genes? C a…arrow_forward
- Explain how a loss-of-function allele in a gene encoding a cohesin protein could be dominant to itswild-type counterpart.arrow_forwardIf a Drosophila is found to have axons that cross back and forth over the body's midline several times, it is most likely a) a Robo knockout. b) a Slit knockout. c) a commissureless mutant. d) normal.arrow_forwardHow would you explain gene expression? How is it that a particular genotype is actually expressed as a phenotype? I am looking for details here, including an explanation of the molecular mechanisms involved.arrow_forward
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