In at least 5 sentences, describe the technique of x-ray crystallography.

The technique of X-ray crystallography is used for finding the atomic (gives energy to atoms and then to molecules) and molecular structure (The arrangement of chemical bonds between atoms in a molecule). The crystals will then cause the X-ray to beam a pattern onto a film structure. Then finally you're left with a diffraction pattern (passing through a narrow aperture (film) or across an edge, typically accompanied by interference between the wave forms produced).

"do a testcross with a homozygous recessive plant."