Can I get admission in B tech genetic engineering course after passing 12th grade examination without mathematics subject

Yes you are eligible to get admission in B tech genetic engineering course after passing 12th grade examination without mathematics subject .. mathematics subject is not compulsory for admission in Genetic Engineering

B.Tech. Genetic Engineering Eligibility
You have to passed 10+2 or equivalent examination with Biology, Chemistry and biology as well as genetics as part of the biology from a well recognized university
OR
a bachelors degree in science or molecular biology

For admission you have to pass an entrance examination organized by college administration.

Best colleges :
Centre for Biotechnology, Pondicherry University, Pondichery-605 014.
Department of Zoology, Poona University, Pune-411 007, Maharashtra.
Indian Institute of Technology, Powai, Mumbai-400 076.
University of Kerala, Thiruvananthaouram-34, Kerala.
University of Madras, Centenary Building Chepauk, Triplicane PO, Chennai-600 005
Jiwaji University, Gwalior-474 011.
Centre for Plant Molecular Biology, Tamilnadu Agricultural University, Coimbatore-641 003
Centre for Biotechnology, Anna University, Chennai, Tamil Nadu-25.
Bharathiar University, Coimbatore-641 046, TN
Calicut University, Kozhikode-673 635, Kerala