Many geneticists study the genetic material of organisms such as mice, fruit flies, and yeast. they are able to apply what they learn from these organisms to humans because virtually all different types of organisms:

Study on Genetic material of model organisms like mice, fruit fly and yeast applying to human beings for various benefits or applications in an enormous way is the biggest achievement of genetic engineering and biotechnology principles.

The reason behind this application is virtually all different types of organisms have same genetic code.