prophase meiosis

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• Prophase — Prophase, from the ancient Greek πρό (before) and φάσις (stage), is a stage of mitosis in which the chromatin condenses (it becomes shorter and fatter) into a highly ordered structure called a chromosome in which the chromatin becomes visible.… …   Wikipedia

• Meiosis — Not to be confused with miosis, mitosis, or myositis. For the figure of speech, see meiosis (figure of speech). Events involving meiosis, showing chromosomal crossover Meiosis (pronounced /maɪˈoʊsɨs/&# …   Wikipedia

• prophase — The first stage of mitosis or meiosis, consisting of linear contraction and increase in thickness of the chromosomes (each composed of two chromatids) accompanied by migration of the two daughter centrioles and their asters toward the poles of… …   Medical dictionary

• Meiosis — What chromosomes do during germ cell formation to halve the chromosome number from 46 to 23. Chromosomes are the carriers of DNA, the hereditary material, in the cells of the body. The chromosomes are visible under the microscope. Women and men… …   Medical dictionary

• meiosis — A specialized form of nuclear division in which there are two successive nuclear divisions (meiosis I and II) without any chromosome replication between them. Each division can be divided into 4 phases similar to those of mitosis (pro , meta ,… …   Dictionary of molecular biology

• prophase — n. the first stage of mitosis and of each division of meiosis, in which the chromosomes become visible under the microscope. The first prophase of meiosis ocurs in five stages (see leptotene, zygotene, pachytene, diplotene, diakinesis) …   The new mediacal dictionary

• meiosis — reduction division; n. a type of cell division that produces four daughter cells, each having half the number of chromosomes of the original cell. It occurs before the formation of sperm and ova and the normal (diploid) number of chromosomes is… …   The new mediacal dictionary

• prophase — noun Etymology: International Scientific Vocabulary Date: 1884 1. the initial stage of mitosis and of the mitotic division of meiosis characterized by the condensation of chromosomes consisting of two chromatids, disappearance of the nucleolus… …   New Collegiate Dictionary

• prophase — The first stage of nuclear division. The stage during which chromosome pairing occurs in the first division of meiosis (see: leptonema, zygonema, pachynema, diplonema, diakinesis). In mitosis and the second division of meiosis, the chromosomes… …   Glossary of Biotechnology

• prophase — Classical term for the first phase of mitosis or of one of the divisions of meiosis. During this phase the chromosomes condense and become visible …   Dictionary of molecular biology

• prophase — /proh fayz /, n. Cell Biol. the first stage of mitosis or meiosis in eukaryotic cell division, during which the nuclear envelope breaks down and strands of chromatin form into chromosomes. [1880 85; PRO 1 + PHASE] * * * …   Universalium