He gave up dancing in 1938 to study sitar playing under court musician Allauddin Khan. After finishing his studies in 1944, Shankar worked as a composer, creating the music for the Apu Trilogy by Satyajit Ray, and was music director of All India Radio, New Delhi, from 1949 to 1956.han was a rigorous teacher and Shankar had training on sitar and surbahar, learned ragas and the musical styles dhrupad, dhamar, and khyal, and was taught the techniques of the instruments rudra veena, rubab, and sursingar. He often studied with Khan's children Ali Akbar Khan and Annapurna Devi.
In most individuals with Trisomy 13 Syndrome, duplication of chromosome 13 is caused by spontaneous (de novo) errors during the division of reproductive cells in one of the parents (e.g., nondisjunction during meiosis).
Trisomy 21. More than 90 percent of cases of Down syndrome are caused by trisomy 21. A child with trisomy 21 has three copies of chromosome 21 - instead of the usual two copies - in all of his or her cells. This form of Down syndrome is caused by abnormal cell division during the development of the sperm cell or the egg cell.