After MA you may carry on the study further or can apply for a job in the related field. There is various scope after the master's degree. If you are interested in lectureship at the university level or in colleges you may appear for selection exam or can go for the research.
The UGC NET or CSIR NET exams are conducted for the selection of assistant professor post in universities or colleges and for junior fellowship award or to pursue the Ph.D.
The candidates who have completed the post graduation degree can apply for NET exam. The NTA will conduct the UGC NET exam twice
After BDS, you can do clinical courses like diplomas in dentistry. Otherwise, you can do administrative/management courses to get into the managerial positions. As most of the BDS is doing the management course in order to find a better career. As the demand for healthcare managers and hospital administrators is increasing in the medical/healthcare industry. Know about the management skills that you can learn for the career advancement - Click here
In general, to study genetics, the student needs to be from the Science background. Mainly should have studied and must have an interest in Biology, as mainly genetics would study of genes and chromosome and cells and their intercations. Hence apart from Biology, one must have equal understanding and knowledge of physics and chemistry.
Hence after a masters in chemistry too, you could opt for a research in Genetics.
But as a word of caution, I would suggest, check with the University you wish to apply to, as to their eligibility criteria.
Hope this helps.
Wish you good