L> Meiosis Tutorialfunction nameit(window) self.name="main" var remote = null; function movie() remote = window.open("", "Movie", "width=250,height=275,resizable=yes"); if (remote != null) if (remote.opener == null) remote.opener = self; remote.location.href = "meiosis1_movie.html" remote.focus() var far = null; function movie2() far = window.open("", "Movie", "width=250,height=275,resizable=yes"); if (remote != null) if (remote.opener == null) remote.opener = self; remote.location.href = "meiosis2_movie.html" remote.focus()

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The lifwynnfoundation.org project > cabinet lifwynnfoundation.org > Meiosis > Meiosis ns & II

Meiosis TutorialMeiosis ns & II What is meiosis I?In meiosis I, chromosomes in a diploid cell resegregate, creating four haploid daughter cells. The is this step in meiosis that generates hereditary diversity.The phases the meiosis ns & II Prophase ns DNA replication precedes the begin of meiosis I. During prophase I, homologous chromosomes pairand type synapses, a step distinctive to meiosis. The combine chromosomes are dubbed bivalents, and also the formationof chiasmata caused by hereditary recombination i do not care apparent. Chromosomal condensation allows these to be viewed in the microscope. Note that the bivalent has two chromosomes and also four chromatids, through one chromosome comes from each parent. Prometaphase i The nuclear membrane disappears. One kinetochore creates per chromosome fairly than one every chromatid, and also the chromosomes attached come spindle fibers begin to move. Metaphase ns Bivalents, each composed of 2 chromosomes (four chromatids) align at the metaphase plate. The orientationis random, with either parental homologue ~ above a side. This means that over there is a 50-50 chance for the daughter cellsto get either the mother"s or father"s homologue for each chromosome. Anaphase ns Chiasmata separate. Chromosomes, each with two chromatids, move to different poles. Each of the daughter cells is currently haploid (23 chromosomes), but each chromosome has two chromatids. Telophase i nuclear envelopes might reform, or the cell may conveniently start meiosis II. Cytokinesis Analogous to mitosis where two complete daughter cells form. Meiosis IAnimation(360 kb)Meiosis II Animation(360 kb)
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Meiosis II is similar to mitosis. However, there is no "S" phase.


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The chromatids of every chromosome room no longeridentical due to the fact that of recombination. Meiosis II the end the chromatids developing two daughter cells each v 23 chromosomes (haploid), and also each chromosome has actually only one chromatid.Previous | NextVocabulary The lifwynnfoundation.org task > cell lifwynnfoundation.org > Meiosis > Meiosis 1 & 2
The lifwynnfoundation.org task room of Biochemistry and Molecular Biophysics college of lifwynnfoundation.org April 1997 Revised: august 2004 contact the development Team