hello,

obstetrics and gynacology are related to medicine field ,, a md or ms is done in these , after mbbs . msc nursing can be done to study these too , but for that you must have done bsc nursing with minimum 50 marks .

so, you can not do this after bsc biotechnology , mbbs needs to be done , to become a gynacologist , or you can study these someway in nursing too.

hope it helps

all the best.