The prenatal period is a time of dramatic plasticity, when the brain is laying down the structures that control neurobiological function across life. Molecular “switches” that regulate the way that genes are activated without changing the underlying DNA blueprint decides whether you will get male brain or female brain. Process is called DNA methylation , an Epigenetic process.Epigenetic processes play a key role in orchestrating transcriptional regulation during development. Now, modern science is in nascent stage to understand Epigenetic process. It is good that they slowly are debunking Gene dogmas. But on the other hand, they are surrendering to molecular switches. The real Epigenetic process does not begin in molecules outside DNA or outside cells but in mind. That is the root of the all Epigenetic processes. In womb, it is mother's mind and how she is affected by external environment (+ past like karma of the mind under re-development in the womb). Mind is like blueprint of execution stored on cloud. You begin from where you stopped in last birth. Hint: Why one should recite Ramayana during pregnancy. Why one should read prescribes texts during pregnancy. Epigenetic! http://www.exeter.ac.uk/news/research/title_432742_en.html
