Medicine in the Genomic Era Lecture 1- Sizing up the Brain Gene by Gene Natasha Marfatia 1. The human genetic code is written in a(n) ______ containing ____ letters. It is over _____ letters long and encodes around ______ genes. 2. What is the cause of the drop in cost to sequence DNA? 3. Cerebral cortex makes up how much of the whole brain? 4. What is myelin? 5. Is it likely for someone under the age of 20 to develop Alzheimer?s or someone over the age of 60 to develop Alzheimer?s? 6. What is the name of the condition when the brain too small? 7. What is hemispherectomy? 8. Name a negative effect of Dante?s surgery. 9. Hemimegalencephaly includes an abnormality with the ________________. 10. Is there a connection between hemimegalencephaly and cancer?