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Topic: Meiosis


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  Meiosis
Meiosis reduces the number of chromosomes in the cells.
Many of the mechanics of the processes of mitosis and meiosis are similar, but the outcomes are very different.
To reduce the number of chromosomes, Meiosis uses two separate cell divisions (cytokinesis), in contrast to the single division in mitosis.
bioweb.wku.edu /courses/BIOL115/Wyatt/Genetics/Meiosis.asp   (398 words)

  
  Meiosis
Meiosis is a special type of cell division that produces gametes with half as many chromosomes.
It is because of the way in which genes recombine in meiosis and syngamy that we have the whole study of genetics.
These two division processes are referred to as Meiosis I and Meiosis II, and result in a total of four daughter cells, each with a 1n chromosome number.
biology.clc.uc.edu /courses/bio104/meiosis.htm   (1102 words)

  
  meiosis   (Site not responding. Last check: )
Meiosis is a specialized type of cell division that occurs in the formation of gametes such as egg and sperm.
Meiosis I, the first of the two divisions, is often called reduction division, since it is here that the chromosome compliment is reduced from 2N (diploid) to 1N (haploid).
Meiosis II Meiosis II is quite simple in that it is simply a mitotic division of each of the haploid cells produced in Meiosis I. There is no Interphase between Meiosis I and Meiosis II and the latter begins with:
taggart.glg.msu.edu /bs110/meiosis.htm   (577 words)

  
 meiosis
Meiosis, as a kind of understatement, names one of the two principle means of communicating through irony (the other being overstatement — see hyperbole, below).
Meiosis does not work as a figure unless one senses the degree of difference between the label and the thing it labels.
ER D4v ("meiosis" "tapinosis" "diminutio"); Sherry (1550) 61 ("miosis," "diminutio"); Peacham (1577) N4v; Putt.
rhetoric.byu.edu /figures/M/meiosis.htm   (194 words)

  
 Meiosis
Meiosis describes the cell division during which (i) this recombination occurs and (ii) the total amount of DNA in a cell is cut in half (haploidy).
Meiosis is a form of nucleus duplication which in many ways resembles the simpler mitotic nuclear duplication, though with a few major difference between the two mechanisms.
Instead, in the course of meiosis there is a reduction division (decrease in chromosome number from diploid to haploid), recombination between parental chromosomes, and an independent assortment of recombined parental chromosomes to opposite cell poles.
www.mansfield.ohio-state.edu /~sabedon/biol1115.htm   (2930 words)

  
 Meiosis
Meiosis starts with diploid cells, or cells that have two sets of chromosomes from their parents.
The purpose of meiosis is to increase the genetic variation.
Meiosis is used in sexual reproduction, since to reproduce, an egg and a sperm have to come together for reproduction to occur.
library.thinkquest.org /C004535/meiosis.html   (182 words)

  
 Why Meiosis is my Favorite Biological Problem
Meiosis I is thus called a reductional division, because the number of chromosomes is reduced in half.
Meiosis II resembles a mitotic division more closely than does meiosis I. The major difference is the lack of an S phase, as meiosis II chromosomes are already replicated.
The pairing problem Meiosis is thus the essential complement to the genome doubling at fertilization that occurs in sexually reproducing organisms, as it provides a mechanism to reduce the genome size in half.
www.ocf.berkeley.edu /~pcarlton/meiosis.html   (992 words)

  
 Meiosis Summary
Meiosis is a type of cell division that, in humans, occurs only in male testes and female ovary tissue, and, together with fertilization, it is the process that is characteristic of sexual reproduction.
Meiosis is a very tightly regulated process, and a whole series of control mechanisms (constituting a number of "checkpoints") exist to ensure that everything proceeds in the correct manner.
Meiosis I and II are both divided into prophase, metaphase, anaphase, and telophase subphases, similar in purpose to their analogous subphases in the mitotic cell cycle.
www.bookrags.com /Meiosis   (6786 words)

  
 What's meiosis?
Meiosis is a very specialized process of cell division that produces gametes (eggs and sperm), and is quite distinct from the mitotic cycle of normally dividing cells.
In humans, it is estimated that at least 10% of conceptions have defects that probably occurred during meiosis of either paternal or maternal gametes.
And, the physcial mechanism of recombination is often required for the chromosomes to segregate properly in the Meiosis I division.
www-rcf.usc.edu /~forsburg/meiosis.html   (588 words)

  
 meiosis
It only occurs in eukaryotic cells, and is part of a life cycle that involves sexual reproduction because it allows the genes of two parents to be combined without the total number of chromosomes increasing.
In meiosis, the nucleus of a cell divides twice.
In sexually reproducing diploid animals (having two sets of chromosomes per cell), meiosis occurs during formation of the gametes (sex cells –; see sperm and ovum), so that the gametes are haploid (having only one set of chromosomes –; half the number of chromosomes of the parent cell).
www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0015134.html   (424 words)

  
 LabBench
Meiosis follows phases similar to those in mitosis, but the outcome of the process is very different.
The DNA of the parent cells is replicated in interphase preceding both mitosis and meiosis.
Meiosis reduces the chromosome number of the parent cell so that four daughter cells are produced, each with one-half the chromosome number of the parent cell.
www.phschool.com /science/biology_place/labbench/lab3/concepts2.html   (110 words)

  
 Meiosis Tutorial
Meiosis I & II What is meiosis I? In meiosis I, chromosomes in a diploid cell resegregate, producing four haploid daughter cells.
DNA replication precedes the start of meiosis I. During prophase I, homologous chromosomes pair and form synapses, a step unique to meiosis.
Meiosis II separates the chromatids producing two daughter cells each with 23 chromosomes (haploid), and each chromosome has only one chromatid.
www.biology.arizona.edu /cell_bio/tutorials/meiosis/page3.html   (253 words)

  
 meiosis from Online Medical Dictionary
Meiosis reduces the starting number of 4n chromosomes in the parent cell to n in each of the 4 daughter cells.
Meiosis occurs during the formation of gametes in animals, which are thus haploid and fertilization gives a diploid egg.
In plants meiosis leads to the formation of the spore by the sporophyte generation.
cancerweb.ncl.ac.uk /cgi-bin/omd?query=meiosis   (196 words)

  
 meiosis
Meiosis, as a kind of understatement, names one of the two principle means of communicating through irony (the other being overstatement — see hyperbole, below).
Meiosis does not work as a figure unless one senses the degree of difference between the label and the thing it labels.
ER D4v ("meiosis" "tapinosis" "diminutio"); Sherry (1550) 61 ("miosis," "diminutio"); Peacham (1577) N4v; Putt.
humanities.byu.edu /rhetoric/Figures/M/meiosis.htm   (191 words)

  
 Meiosis, initiation of
Germ cells, during meiosis, are closely associated with somatic cells and it is unknown whether this signal acts directly on the germ line, or through neighboring somatic cells.
Two other synthetic C29 sterols also caused meiosis to resume in mouse oocytes, thus suggesting that a family of sterols are involved in inducing meioisis in oocytes.
In addition to the discovery of meiosis activating sterols, a fatty acid derivative simply termed as MPS (meiotic preventing substance), was present in germ cells not undergoing meiosis.
www.ucalgary.ca /UofC/eduweb/virtualembryo/meiosis_init.html   (984 words)

  
 Meiosis
Meiosis is a process of cell division in eukaryotes characterized by:
Meiosis not only preserves the genome size of sexually reproducing eukaryotes but also provides three mechanisms to diversify the genomes of the offspring.
In meiosis I, the orientation of paternal and maternal homologues at the metaphase plate is random.
users.rcn.com /jkimball.ma.ultranet/BiologyPages/M/Meiosis.html   (1379 words)

  
 Meiosis - The Genetics of Reproduction - Genetics and Evolution
This remains the case when passing genetic information to offspring, that can occur via a process called meiosis where four haploid cells are created from their diploid parent cell.
The process of meiosis essentially involves two cycles of division, involving a gamete mother cell (diploid cell) dividing and then dividing again to form 4 haploid cells.
Overall, this process of meiosis creates gametes to pass genetic information from parents to offspring, continuing the family tree and the species as a whole.
www.biology-online.org /2/1_meiosis.htm   (532 words)

  
 Meiosis
Meiosis and mitosis are compared in Figure 20-7.
The principles of meiosis are the same in plants and animals and in males and females.
Meiosis is dominated by prophase of meiotic division I, which can occupy 90% or more of the total meiotic period.
www.ncbi.nlm.nih.gov /books/bv.fcgi?db=Books&rid=mboc4.section.3686   (4157 words)

  
 Meiosis   (Site not responding. Last check: )
Meiosis is the process of cell division by which gametes with half the number of chromosomes are created so when sperm and egg unite in sexual reproduction the diploid number of chromosomes is reconstituted.
Meiosis does not randomly separate chromosomes but insures that each homologous chromosome pair in a diploid cell is divided so that each gamete contains one of each type of chromosome.
Thus, in meiosis the number of microtubules in the spindle equals the number of tetrads (chromosome pairs) not chromosomes.
www.scientia.org /cadonline/Biology/genetics/meiosis.ASP   (833 words)

  
 Botany online: Cytology, Mitosis, Meiosis - Meiosis
Meiosis is made up by two subsequent processes, both of which resemble mitosis.
At the beginning of meiosis, in prophase 1 the nuclear envelope disintegrates and chromosomes become visible as in mitosis (1).
As a result of the meiosis of a diploid cell, four haploid cells (gones) form, of which one (at egg cell formation) or all (at pollen formation) can develop into gametes.
www.biologie.uni-hamburg.de /b-online/e09/09b.htm   (847 words)

  
 Meiosis
Meiosis is the type of cell division by which germ cells (eggs and sperm) are produced.
Meiosis involves a reduction in the amount of genetic material.
Meiosis differs from mitosis primarily because there are two cell divisions in meiosis, resulting in cells with a haploid number of chromosomes.
www.accessexcellence.org /AB/GG/meiosis.html   (202 words)

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