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Meiosis is a type of cell division that produces haploid gametes, the sperm or egg cells, in sexually-reproducing organisms. It involves two rounds of division with genetic recombination and segregation of chromosomes, and is essential for sexual reproduction and variation.
Learn about the structure, function and surgery of the human nose, the first organ of the respiratory system and the principal organ of smell. The nose is composed of bones, cartilages, soft tissues, muscles, nerves and blood vessels, and can be modified by rhinoplasty.
Learn about the evolutionary origins and adaptive functions of meiosis, the process of sexual reproduction in eukaryotes. Compare two theories on how meiosis arose from prokaryotic sex or mitosis, and explore the evidence from molecular and genetic data.
Learn about the series of stages of the life of an organism, that begins as a zygote and concludes as an adult that reproduces. Find out the types and examples of life cycles that involve sexual reproduction, meiosis, and alternation of generations.
Cell division is the process by which a parent cell divides into two daughter cells, either genetically identical (mitosis) or with reduced chromosomes (meiosis). Learn about the different forms of cell division in prokaryotes and eukaryotes, and the stages of the cell cycle and DNA replication.
Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete with a single set of chromosomes combines with another gamete to produce a zygote that develops into an organism with two sets of chromosomes. Learn about the evolution, advantages, disadvantages, and examples of sexual reproduction in animals, plants, and other eukaryotes.
Learn about the exchange of genetic material between different organisms that leads to novel combinations of traits. Find out how recombination occurs in eukaryotes, bacteria, archaea, and in vitro settings, and how it is catalyzed by enzymes and influenced by distance.
Learn how chromosomes separate from each other and migrate to opposite poles of the nucleus during mitosis and meiosis. Find out how crossovers, cohesion and chiasmata facilitate and regulate the process of chromosome segregation.