Chromosomes Genetics 37 Biology 20 Heredity 16 Cytogenetics 15 Cell Division 9 Linkage 9 Mitosis 9 Sex determination 9 Meiosis 8 Mendelism 8 Microbiology 8 Cell division 7 Genes 7 sex determination 7 Cytoplasmic inheritance 6 Gene Mutation 6 Mutation 6 Morphology 5 Cells 4 Cytology 4 Evolution 4 Molecular biology 4 Physical anthropology 4 Gene expression 3 Gene mutation 3 Human genetics 3 Metabolism 3 Molecular genetics 3 Mutations 3