1. The second chromosomal abnormality is called heterochromatin repulsion ( HR ). 2. Methylation at lysine 9 is associated with transcriptional repression and heterochromatin . 3. Facultative heterochromatin is the result of genes that are RNAi. 4. It is not repetitive and shares the compact structure of constitutive heterochromatin . 5. The regions that stain darker are regions of constitutive heterochromatin . 6. The three most common modifications in constitutive heterochromatin are heritable. 7. More condensed ( tightly packed ) DNA is referred to as heterochromatin . 8. During cell division, heterochromatin formation is required for proper chromosome segregation. 9. The inner plate appears like a discrete heterochromatin domain throughout the cell cycle. 10. Visualization of constitutive heterochromatin is possible by using the C-banding technique.