reductional division

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• Reduction division — The first cell division in meiosis, the process by which germ cells are formed. A unique event in which the chromosome number is reduced from diploid (46 chromosomes) to haploid (23 chromosomes). Also called first meiotic division or first… …   Medical dictionary

• equational division — A chromosome division in which the two chromatids of each duplicated chromosome separate longitudinally, prior to being incorporated into two daughter nuclei. Seen at the mitotic type second division of meiosis; also in somatic mitosis and the… …   Glossary of Biotechnology

• reproductive system, animal — Introduction       any of the organ systems by which animals reproduce.       The role of reproduction is to provide for the continued existence of a species; it is the process by which living organisms duplicate themselves. Animals compete with… …   Universalium

• 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

• August Weismann — Friedrich Leopold August Weismann (Birth. January 17, 1834 in Frankfurt am Main; Death. November 5 , 1914 in Freiburg im Breisgau, ) was a German biologist. [ [http://www.nndb.com/people/747/000091474/ August Weismann ] at www.nndb.com] Ernst… …   Wikipedia

• covery — noun a dispelling of false or misleading notions This book is indispensable not only because of the discoveries it describes, but almost equally on account of the coveries, to borrow a word from Samuel Butler. A fundamental covery is that the… …   Wiktionary

• heterotypic — /het euhr euh tip ik/, adj. Biol. of or pertaining to the first or reductional division in meiosis. Also, heterotypical. Cf. homeotypic. [1885 90; HETERO + TYPIC] * * * …   Universalium

• Meiotic recombination checkpoint — The meiotic recombination checkpoint monitors the meiotic recombination during meiosis, and blocks the entry into metaphase I if the recombination is not efficiently processed. Meitotic recombination contributes to the cells in two different ways …   Wikipedia

• heterotypic — het•er•o•typ•ic [[t]ˌhɛt ər əˈtɪp ɪk[/t]] also het er•o•typ′i•cal adj. cbl of or pertaining to the first or reductional division in meiosis • Etymology: 1885–90 …   From formal English to slang

• reduction — reductional, adj. /ri duk sheuhn/, n. 1. the act of reducing or the state of being reduced. 2. the amount by which something is reduced or diminished. 3. a form produced by reducing; a copy on a smaller scale. 4. Cell Biol. meiosis, esp. the… …   Universalium

• reduction — noun Etymology: Middle English reduccion restoration, from Middle French reducion, from Late Latin & Latin; Late Latin reduction , reductio reduction (in a syllogism), from Latin, restoration, from reducere Date: 15th century 1. the act or… …   New Collegiate Dictionary