Campbell Biology in Focus
3rd Edition
ISBN: 9780135191873
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 16, Problem 4TYU
Absence of bicoid mRNA from a Drosophila egg leads to the absence of anterior larval body parts and mirror-image duplication of posterior parts. This is evidence that the product of the bicoid gene
- A. normally leads to formation or head structures.
- B. normally leads to formation or tall structures.
- C. is transcribed in the early embryo.
- D. is a protein present in oil head structures.
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Students have asked these similar questions
A key event that initially determines female or male development in Drosophila is the
a. transcription of the Sxl gene.
b. alternative splicing of the Sxl pre-mRNA.
c. expression of the ix gene.
d. expression of the her gene.
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.
What is the difference between a maternal-effect gene and a zygotic gene? Of the following genes that play a role in Drosophila development, which are maternal-effect genes and which are zygotic? Explain your answer.
A. nanos
B. Antp
C. bicoid
D. lab
Chapter 16 Solutions
Campbell Biology in Focus
Ch. 16.1 - Prob. 1CCCh. 16.1 - MAKE CONNECTIONS Explain how the signaling...Ch. 16.1 - How do fruit fly maternal effect genes determine...Ch. 16.2 - Prob. 1CCCh. 16.2 - Deitys egg donor and surrogate mother were...Ch. 16.2 - Prob. 3CCCh. 16.3 - Prob. 1CCCh. 16.3 - Prob. 2CCCh. 16.3 - Prob. 3CCCh. 16 - Muscle cells differ from nerve cells mainly...
Ch. 16 - Cell differentiation always involves A. the...Ch. 16 - Prob. 3TYUCh. 16 - Absence of bicoid mRNA from a Drosophila egg leads...Ch. 16 - Prob. 5TYUCh. 16 - Prob. 6TYUCh. 16 - Prob. 7TYUCh. 16 - FOCUS ON ORGANIZA-ION The property of life emerges...Ch. 16 - SYNTHESIZE YOUR K\IOWLEDGE Recently, new...
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- Master regulatory genes play critical roles in development. Predict the MOST likely fate of a fly embryo where master regulatory genes were nonfunctional due to mutation. A. Cell division would stop, and the embryo would halt development. B. The embryo would be a collection of undifferentiated cells because they never get the message that will send them down a determination pathway. C. The embryo would be a combination of differentiated and undifferentiated cells because, even in the absence of a functional master regulatory gene, some cells will differentiate on their own. D. The embryo would continue to develop, but there is a high probability that some limbs may end up in the wrong place in the adult.arrow_forwardWhich of the following genes is transcribed in the Drosophila embryo? O a. bicoid O b. germ cell-less Oc. bindin d. even-skippedarrow_forwardIn 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?arrow_forward
- If a Drosophila larva is missing much of its posterior end it is likely due to a mutation che: A. maternal bicoid gene. B. zygotic bicoid gene. C. maternal nanos gene. D. zygotic nanos gene.arrow_forwardIn 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 genesarrow_forwardWhat 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. caudalarrow_forward
- Developmental genes are often highly conserved. However, organisms with very similar genes can appear quite different. How is this possible? A. The genes may usually undergo mutation during development, resulting in the production of varied proteins in individual cells. B. If an identical gene is turned on at different stages in development, it can have very different effects. C. Even if genes are quite similar, they always produce proteins with different functions. D. If the genes are very similar, they must always be expressed similarly (at similar times in development) but may sometimes still have varying effects.arrow_forwardWhich of the following statements about the differential expression of human genes is correct? A. Differential expression does not occur during embryogenesis (development of the embryo). B. The unused genes in differentiated cells no longer retain the potential to be expressed. C. Gene expression patterns of all cells are identical. D. Every cell nucleus contains the complete genome established in the fertilized egg.arrow_forwardWhen comparing gene expression of the cells of the ICM and those of the trophoblast, which of the following is TRUE? a. Cells of the trophoblast express Nanog. b. Cells of the ICM and trophoblast will show the same gene expression pattern. c. ICM cells express Cdx2. d. Cells of the ICM express Oct 4arrow_forward
- 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 O d. all of the abovearrow_forwardWhich of the following correctly explains how gene expression can change in a differentiating cell in an animal embryo?A. DNA methylation triggered by apoptosis leads to suppression of some genes and expression of others.B. Presence of germ layers trigger hormonal release from endocrine glands, signaling to certain cells to express genes.C. Cell signals through plasmodesmata allow coordination of cellular activities and cell differentiation.D. Cues from the cytoplasm and from surrounding cells can induce changes in gene expression.arrow_forwardDiscuss 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_forward
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