6. A chromosome is formed from the condensation, coiling and shortening of chromatin threads
7. Structure of a chromosome - the point where the two chromatids touch, and w here the microtubules attach - one of the two identical parts of the chromosome after S phase
12. Attachment of microtubules to kinetochore - is the protein structure at the centromere of the chromosome where the spindle fibers attach during division to pull the chromosomes apart