Experiment. Magnifier

Date: 2015-10-07; view: 542.

Effect of temperature on the development of vestigial wings

You can see that the development in low temperature conditions (18-16) bend of the wings that form an almost imperceptible, and at first glance, the posterity is indistinguishable from normal Drosophila. Only a careful examination under a binocular microscope reveals barely noticeable bend at the ends of the wings.

Consider a single loop anesthetized flies Curly, and compare them with wings Curly, which developed under optimum conditions (25-26), and normal Drosophila.

This action delays the development period of insects for several days and leads to changes in the nature of their wings.

For the experiment, culture after Curly pupation is exhibited from the thermostat and remains at room temperature.

Experiment. Binocular or a simple magnifier.

Effect of temperature on the development of wings Curly

Mutation Curly. Magnifier

Consider the structure of the wing mutation Curly. They are characterized by strong cocked.
Mutation vestigial. Magnifier

This form of wings are reduced to the extent of minor appendages on the sides of the chest.

Several crops are grown vestigial at different temperatures conditions: at room temperature at an optimum (25-26), at 29; at 30-31. Vestigial flies are placed in an incubator with a fever a day after setting culture. Period of development of their offspring is reduced for a few days as compared with development in conditions of optimum temperature.
Compare anesthetized vestigial wings, the development of which took place at different temperatures, between themselves and with the wings of normal fruit flies. It is easy to detect a direct relationship of the wings of this form of the temperature conditions in which it proceeded.
At low temperatures the reduction of wings is expressed to the greatest degree. Under optimal conditions, the reduction is less pronounced. Development at a temperature of 29-25 led to a slight increase in the size of the wings, but the venation on them has increased significantly. Development at 30-31 is accompanied by a lengthening of the wings and an increase in their venation. Along the length of the wings close to the size of a normal fruit fly wings, but they remain tight. Often on the left and right side wings develop unevenly.

Primula sinensis, contained in different temperature conditions. Living plants. Demonstration.
Primula plant with its contents under high temperature and high humidity of 30-35 gave the flowers of white coloration.