The early Drosophila embryo is a syncytium. Why is this significant? O a. it allows the segment polarity proteins, Wingless and Hedgehog, to function as morphogens to establish the segmental boundaries O b. it allows the establishment of transcription factor gradients, which provide positional information O c. it eliminates the need for localized cytoplasmic determinants Od. all of the above

The early Drosophila embryo is a syncytium. Why is this significant? O a. it allows the segment polarity proteins, Wingless and Hedgehog, to function as morphogens to establish the segmental boundaries O b. it allows the establishment of transcription factor gradients, which provide positional information O c. it eliminates the need for localized cytoplasmic determinants Od. all of the above

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter17: Developmental Genetics

Section: Chapter Questions

Problem 3TYU: The anteriorposterior axis of a Drosophila embryo is first established by certain (a) homeotic genes...

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In Drosophila, which is true of zygotic gene expression? O a. the first zygotic genes expressed are an interpretation of positional information specified by morphogen gradients O b. the first zygotic genes expressed encode germ cell determinants O c. the first zygotic genes expressed specify segmental boundaries O d. the first zygotic genes are expressed at the cellular blastoderm stage O e. all of the above
What factor does NOT contribute to establishment of the hunchback gradient in the Drosophila embryo? O a. maternal source of hunchback mRNA O b.nanos O c. bicoid O d. caudal
In mice, the copy of the Igf2 gene that is inherited from the mother isnever expressed in her offspring. This happens because the Igf2 genefrom the mothera. always undergoes a mutation that inactivates its function.b. is deleted during oogenesis.c. is deleted during embryonic development.d. is not transcribed in the somatic cells of the offspring.
In flies developing from eggs laid by a nanos−mother, development of the abdomen is inhibited.Flies developing from eggs that have no maternallysupplied hunchback mRNA are normal. Flies developing from eggs laid by a nanos− mother that alsohave no maternally supplied hunchback mRNA arenormal. If too much Hunchback protein accumulatesin the posterior of the egg, abdominal developmentis prevented.a. What do these findings say about the function ofthe Nanos protein and of the hunchback maternallysupplied mRNA?b. What do these findings say about the efficiency ofbiological processes that are subject to evolution?
Which of the following genes is transcribed in the Drosophila embryo? O a. bicoid O b. germ cell-less Oc. bindin d. even-skipped
The anteriorposterior axis of a Drosophila embryo is first established by certain (a) homeotic genes (b) maternal effect genes (c) segmentation genes (d) proto-oncogenes (e) pairrule genes
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“In the early Drosophila embryo, the establishment of different body regionor tissues along, on the one hand, the anteroposterior axis and, on theother, the dorsoventral axis are initiated by clues provided by the egg’smother; however the nature of those signals and the way in which theyoperate is completely different”. Discuss whether this statement is correct.
Researchers know that Fru-M controls male sexualbehavior in Drosophila because inappropriate Fru-Mexpression in females causes them to behave likemales: Such females display male behaviors that areoriented toward other females.a. Describe a fru mutation that could cause the expression of Fru-M in females.b. Describe a transgene construct that scientistscould generate and insert into Drosophila femalesthat would have the same effect as the mutant youdescribed in (a).
In an embryo from a homozygous Bicoid mutant female,which class(es) of gene expression is (are) abnormal?a. Gap genesb. Pair-rule genesc. Segment-polarity genesd. Hox genes
Defects in this gene have been associated with metastasis in pancreatic cancer. Select one: O a. APC O b. RB O c. p53 O d. C-myc O e. Palladin O f. ras O g. BRCA1
Which of the following statement(s) is/are true with regard to positional information in Drosophila? A. Morphogens are a type of molecule that conveys positional information. B. Morphogenetic gradients are established only in the oocyte, prior to fertilization. C. Cell adhesion molecules also provide a way for a cell to obtain positional information.