chromosome Cytology 5 protoplast 5 cell - organism 4 Biology 2 cytogenetics 2 epistasis 2 Cell biology 1 Genetics 1 Photophysiology 1 bacteria 1 bioluminescence 1 cell 1 cell division 1 cell wall 1 cytology 1 electron resonance study 1 gene 1 generalized cell 1 genes 1 genetics 1 heredity 1 linkage 1 meiosis 1 mendalism 1 mendelism 1 mitosis 1 photochemistry 1 photosynthesis 1 protein synthesis 1