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Genetics has now assumed a central role in biology, as an understanding of gene structure and expression is important in the study of cell biology, biochemistry, microbiology and biotechnology. The historical development of genetics is conventionally divided into four phases. The first is the classical phase of Mendelian or transmission genetics which deals with the transmission of genes from generation to generation as deduced by the observation f different traits or phenotypes, and genetic recombination. The second phase, cytogenetics, deals with the correlation of genetic and cytological (especially chromosomal) features of particular genetic systems. The third phase, biochemical genetics, deals with the chemical nature and action of heredity determinants. The fourth phase, molecular genetics, is concerned with the interpretation of genetic mechanisms at the molecular level in terms of the principles of chemistry and physics. Running parallel with these phase were studies on population genetics and quantitative genetics which deal with variation of genes within populations. Modern genetics is a combination of two or more of the above areas. Book Content of Genetics Volume I Unit 1 1. Introduction 2. Chromosome Structure Unit 2 3. Interaction of Genes I : Intralocus Interactions 4. Interaction of Genes II : Interlocus Interactions, Epistatic and Nonepistatic 5. Interaction of Genes III : Interlocus Interactions, Additive or Polygenic Inheritance 6. Interaction of Genes IV : Gene-Environment Interactions Unit 3 7. Maternal Effects and Cytoplasmic Inheritance 8. Linkage and Crossing Over Unit 4 9. Genetics of Six I : Sex Determination Mechanisms 10. Genetics of Six II : Sex Determination Anomalies 11. Genetics of Six III : Sex Determination Inheritance Unit 5 12. Nucleic Acids I : Structure and Characteristics of DNA 13. Nucleic Acids II : Structure and Characteristics of RNA
