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Chapter 26: Problem 11

Describe the function of the Bicoid protein. Explain how its ability to exert its effects in a concentration-dependent manner is a critical feature of its function.

Short Answer

Expert verified
The Bicoid protein, concentrated at the anterior end of Drosophila embryos, is critical in establishing the anterior-posterior body pattern. Its concentration-dependent gradient allows it to influence cell development differently based on location, leading to the creation of distinct body structures.

Step by step solution

01

Role of Bicoid Protein

Bicoid protein is a maternal effect gene that controls the positioning of the anterior-posterior axis in Drosophila embryos (fruit fly). It plays a crucial role in establishing the head and thorax structures of the embryo.
02

Distribution of Bicoid Protein

The Bicoid protein forms a gradient in the egg, with the highest concentration at the anterior end and the lowest at the posterior end. This gradient is formed because the mRNA from which Bicoid is translated is located at the end of the egg.
03

Concentration-dependent Effect

The concentration-dependent effect of the Bicoid protein determines the fate of cells in the embryo. Cells exposed to high concentrations of Bicoid protein develop into head and thorax structures, while cells exposed to lower concentrations develop into posterior structures. This demonstrates how the gradient of Bicoid protein results in different cell fates and thus establishes the body plan.

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