Two haploid cells with duplicate copies of chromosomes are formed after telophase I. Spindle fibers also begin to form at this stage. Prophase involves the coiling and shortening of chromosomes, disintegration of the nuclear envelope, and movement of centrioles towards opposite ends of the cell. The major purpose is to facilitate sexual reproduction through gametogenesis.Ĭertain specialized cells called meiocytes, that are involved in sexual reproduction, undergo meiosis. The major purpose is vegetative growth and asexual reproduction. Genetic variation is introduced during meiotic divisions.Ĭentromeres spilt during anaphase, resulting in the separation of sister chromatids.Ĭentromeres and the sister chromatid pairs remain intact during meiosis I, but separate during meiosis II. The genetic identity is retained after a mitotic division. Synapsis and crossing over between homologous chromosomes occurs during meiosis I. Synapsis and crossing over events do not occur during mitosis. Ploidy reduction occurs giving rise to haploid daughter cells. The ploidy of the daughter cell remains the same as that of the mother cell. Only a diploid mother cell can undergo meiosis. One mother cell undergoes two successive divisions, and gives rise to four daughter cells.Ī haploid or diploid mother cell can undergo mitosis. One mother cell undergoes a single division, and gives rise to two daughter cells.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |