ETEXT CAMPBELL BIOLOGY IN FOCUS INSTANT
3rd Edition
ISBN: 9780135964422
Author: Urry
Publisher: PEARSON
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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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A key event that initially determines female or male development in Drosophila is the
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Chapter 16 Solutions
ETEXT CAMPBELL BIOLOGY IN FOCUS INSTANT
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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- Which 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_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 statements about Tbx5 is true? a. Tbx5, Tbx4, and AmphiTbx4/5 have very similar coding regions. b. Tbx5 is involved in tail development in vertebrates. c. Tbx5, Tbx4, and AmphiTbx4/5 have very similar regulatory regions. d. Tbx5 initiates hindlimb development.arrow_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_forward
- Match these images with the distribution of maternal effects mRNA (before migration) and proteins in Drosophila. anterior A. B. C. anterior anterior bicoid mRNA Bicoid protein nanos mRNA Nanos protein hunchback mRNA Hunchback protein posterior posterior posterior А. A. B. B. A. A. <arrow_forwardDescribe the formation steps of the primary axis that first occurs during development in Drosophila by explaining each molecule.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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