Cell Biology

Learn what meiosis is, how meiosis I and II reduce chromosome number, how crossing over creates genetic variation, and how meiosis differs from mitosis.

Learn what gametogenesis is, how germ cells form haploid gametes, and the stages, regulation, and key differences between spermatogenesis and oogenesis.

Learn what fertilization is, its major types, how sperm and egg unite, how polyspermy is controlled, and how fertilization differs in animals, humans, and flowering plants.

Learn what necrosis is, why it occurs, how cells change, the major patterns of necrosis, key examples, and how necrosis differs from apoptosis.

Learn the Davson–Danielli sandwich model of the cell membrane, including its structure, evidence, limitations, rejection, and fluid mosaic comparison.

Learn about mesosomes in bacteria, including their definition, structure, types, proposed functions, NCERT description, and why modern science considers them fixation artifacts.

Learn what inclusion bodies are, their types, functions and examples in bacteria, viruses and cells, including storage granules, viral inclusions and protein inclusion bodies.

Learn about the nucleoid, its definition, structure, composition, functions, DNA organization, nucleoid-associated proteins, diagram, and nucleoid vs nucleus.

Chromosomes are a collection of tightly coiled DNA that are located in the nucleus of virtually every cell of our body. Humans possess 23 chromosome pairs.