S. Thiruugnanakumar is serving as a Professor and Head (Genetics and Plant Breeding) in Faculty of Agriculture, Annamalai University. A.Anandan obtained his B.Sc. (Ag) degree from Annamalai University and M.Sc (Ag) from Tamil Nadu Agricultural University, Coimbatore and Ph.D in Genetics and Plant Breeding. R. Usha Kumari is working as Professor, Plant Breeding and Genetics at Agricultural College and Research Institute, TNAU, Madurai. N. Senthil Kumar is currently working as Associate Professor in Genetics and Plant Breeding in Faculty of Agriculture, Annamalai University. He has guided seven M.Sc. (Ag) and one Ph.D. students, co-authored two text books and about 40 research papers.

• o Generic Term, o Cell, o Cell Division, o Cell Cycle, o Life Cycle of Plants, o Chromosome Morphology, o History of Development of Mendelian Gene Concept, o Pre-Mendelian Hybridization, o Mendelian Inheritance, o Lethal Genes, o Intergenic Gene Interaction, o Chi-Square Test, o Polygenic Inheritance, o Multiple Alleles, o Chromosome Theory of Inheritance, o Crossing Over, o Linkage, o Sex Determination, o Sex Linked, Sex Limited and Sex Influenced Genes, o Cytoplasmic Inheritance, o DNA the Genetic Material, o Structure of DNA, o DNA Replication, o Protein Synthesis, o Genetic Code, o Gene Regulation, o Modern Concepts of Gene, o Chromosome and Chromatid Organisatio, o Special Chromosomes, o Variation in Chromosome Structure Changes in the Number of Gene Loci, o Variation in Chromosome Structure-Changes Involving the Arrangement of Gene Loci, o Variation in Chromosome Number Euploidy-Auto and Allopolyploids, o Variation in Chromosome Number-Aneuploids, o Missing Link