Heredity Genetics 44 Biology 22 Chromosomes 17 Mutation 10 Evolution 9 Genes 7 Cell Division 6 Gene Mutation 6 Molecular genetics 6 Cytoplasmic inheritance 5 sex determination 5 DNA 4 Mendelism 4 Recombinant DNA 4 Chromosome 3 Developmental Psychology 3 Gene mapping 3 Genomes 3 Linkage 3 Microbiology 3 Sex determination 3 Bacteria 2 Cells 2 Chromosome mutation 2 Cytoplasmic Inheritance 2 Ecology 2 Enzymes 2 Genetic 2 Heterosis 2