For 10 points, name this technique which makes a picture of an organism's chromosomes.
Torbjörn Caspersson's introduction of the fluorescent dye quinacrine was an improvement on previous methods of this technique but was replaced because quinacrine is easily quenched. In situ hybridization techniques are often used in conjunction with this technique in the analysis of a chorionic villi sample or amniocentesis. G-bands are created by the application of the stain Giemsa in this technique after (*) colchicine has been administered to arrest the cell cycle in metaphase. Creating one of these involves lining up autosomes from longest to shortest, and this technique can be used to detect disorders like Turner's, Klinefelter's, or Down syndrome. For 10 points, name this technique which makes a picture of an organism's chromosomes.
Torbjörn Caspersson's introduction of the fluorescent dye quinacrine was an improvement on previous methods of this technique but was replaced because quinacrine is easily quenched.
karyotype [accept word forms]