Most genes are present in the same quantity in every cell - namely, one copy per haploid cell or two copies per diploid cell.

What genes make an exception to this rule?

However, only a small percentage of the genome is expressed in each cell, and the level at which a gene is expressed can vary widely.

Various techniques can be used to detect genes and monitor their expression. These techniques use DNA, RNA or Proteins as the biological material for analysis.

In this tutorial we will describe each method and will discuss its relative pros and cons.

Choose a method
DNA Analysis
RNA Analysis
Protein Analysis
  • Northern blot
  • RT-PCR 
  • RNA In-situ hybridization
  • DNA microarrays