It may take decades or even centuries to completely understand the relationship between genes and disease.

This chapter looks at the relationship between genes and organisms in a new way.

This interaction between genes will be a main theme of Chapter 7.

The book also argues for feedback between genes and environment.

The important differences between genes emerge only in their effects.

The rotenone-rat studies also point to a connection between genes and the environment.

More often than not, they derive from a combination of and interaction between several genes.

But biologists warn that the comparison between genes and language can be taken too far.

Crossing over take place between genes ( the beads in this model ) but never within them.

The analysis reported today was not intended to look at the relationship between genes and intelligence.