Unlike in normal cell division (mitosis), the genetic material of the original (parent) cell is divided up twice. Meiosis, division of a germ cell involving two fissions of the nucleus and giving rise to four gametes, or sex cells, each with half the number of chromosomes of the original cell The process of meiosis is characteristic of organisms that reproduce sexually and have a diploid set of chromosomes in the nucleus. Meiosis produces haploid gametes from a diploid cell Dna replicates once, but the cells divide twice In biology, meiosis is the process where a cell replicates dna once but divides twice, producing four cells that have half the genetic information of the original cell
It is how organisms produce gametes or sex cells, which are eggs in females and sperm in males In meiosis one cell divides. Chiasmata (singular = chiasma) the structure that forms at the crossover points after genetic material is exchanged crossing over (also, recombination) the exchange of genetic material between homologous chromosomes resulting in chromosomes that incorporate genes from both parents of the organism forming reproductive cells fertilization the union of two haploid cells typically from two. Meiosis is a type of cell division in sexually reproducing organisms that reduces the number of chromosomes in gametes (the sex cells, or egg and sperm) In humans, body (or somatic) cells are diploid, containing two sets of chromosomes (one from each parent) To maintain this state, the egg and sperm that unite during fertilization must be haploid, with a single set of chromosomes
This process is crucial for sexual reproduction in eukaryotes. The sex cells that contain only half of the normal number of chromosomes called the haploid number (the symbol is n)
OPEN
