Polytene chromosomes may be defined as the giant chromosomes that contain alternate dark and light bands when view under the microscope. These chromosomes are found in the salivary gland of Drosophila.

These glands are functionally highly active and contain thousand of DNA strands. These chromosomes are aligned parallel with each other as the replication is normal but the cells are unable to separate and fails to undergo the process of cytokinesis.

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4 years ago

While swabbing objects to sample bacteria, you want to create a negative control to ensure that you are practicing proper asepti

irina1246 [14]

The result which would be seen from a properly prepared negative control is nothing.

<h3>What is a Negative control?</h3>

This type of control is used to test and ensure that in the absence of the antigen we do not still get a positive reaction.

Since proper aseptic technique was practised and there was no swabbing of the surface then there would be nothing seen in the properly prepared negative control.

Read more about Negative control here brainly.com/question/7452004

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3 years ago

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