Chapter 18, Problem 18P

Summary Introduction

To analyze:

The bristles that are developed from the epidermis in Drosophila are equally spaced, that makes the two bristles never come about immediately adjacent to each other. Based on this information question is asked how this pattern is established during development.

Introduction:

The pattern of regularly spaced sensory organs is most often observed in many animals. Bristles are such sensory organs which are found on the notum of the Drosophila. These bristles are classified into two classes: the macrochaetes and the microchaetes. The macrochaetes are larger and constant a number of bristles. Each bristle develops from a single cell (precursor) that divides into four cells that construct the bristles organ.