How we behave in the interaction of genes questions???

Can you kindly rephrase your question? It doesn't make much sense.

ok I mean how I can start solving the problem of finding the genotype and phenotype of gene interaction questions???

Sounds like the field you are interested in is functional genomics:

 

http://en.wikipedia.org/wiki/Functional_genomics

 

"The term functional genomics is often used broadly to refer to the many possible approaches to understanding the properties and function of the entirety of an organism's genes and gene products."