Absence of bicoid mRNA from a Drosophila egg leads to theabsence of anterior larval body parts and mirror-imageduplication of posterior parts. This is evidence that the productof the bicoid gene(A) normally leads to formation of head structures.(B) normally leads to formation of tail structures.(C) is transcribed in the early embryo.(D) is a protein present in all head structures.

Absence of bicoid mRNA from a Drosophila egg leads to theabsence of anterior larval body parts and mirror-imageduplication of posterior parts. This is evidence that the productof the bicoid gene(A) normally leads to formation of head structures.(B) normally leads to formation of tail structures.(C) is transcribed in the early embryo.(D) is a protein present in all head structures.

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter50: Animal Development

Section: Chapter Questions

Problem 14TYK

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Another way to study the role of proteins (e.g., transcription factors) that function in development is to microinject the mRNA that encodes a protein, or the purified protein itself, into an oocyte or embryo, and then determine how this affects the subsequent development of the embryo, larva, and adult. For example, if Bicoid protein is injected into the posterior region of an oocyte, the resulting embryo will develop into a larva that has anterior structures at both ends. Based on your understanding of the function of each developmental gene, what would be the predicted phenotype if the following proteins or mRNAs were injected into normal oocytes? A. Nanos mRNA injected into the anterior end of an oocyte B. Antp protein injected into the posterior end of an embryo C. Toll mRNA injected into the dorsal side of an early embryo
Discuss how the anterior portion of the anteroposterior axis is established in Drosophila. What aspects of oogenesis are critical in establishing this axis? What do you think would happen if the bicoid mRNA was not trapped at the anterior end but instead diffused freely throughout the oocyte?
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