L> Meiosis Tutorialfunction nameit(window) self.name="main" var far = null; function movie() far = 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; role 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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Meiosis TutorialMeiosis i & 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 the generates genetic diversity.The phases of meiosis i & II Prophase ns DNA replication precedes the start of meiosis I. Throughout prophase I, homologous chromosomes pairand form synapses, a step unique to meiosis. The combine chromosomes are referred to as bivalents, and also the formationof chiasmata caused by genetic recombination becomes apparent. Chromosomal condensation enables these come be viewed in the microscope. Keep in mind that the bivalent has two chromosomes and also four chromatids, with one chromosome comes from each parent. Prometaphase ns The atom membrane disappears. One kinetochore forms per chromosome fairly than one every chromatid, and also the chromosomes attached to spindle fibers begin to move. Metaphase i Bivalents, each composed of 2 chromosomes (four chromatids) align at the metaphase plate. The orientationis random, v either parental homologue ~ above a side. This means that there is a 50-50 opportunity for the daughter cellsto obtain either the mother"s or father"s homologue for each chromosome. Anaphase ns Chiasmata separate. Chromosomes, each v two chromatids, move to different poles. Every of the daughter cells is currently haploid (23 chromosomes), however each chromosome has two chromatids. Telophase i nuclear envelopes might reform, or the cabinet may easily start meiosis II. Cytokinesis Analogous to mitosis where two finish daughter cells form. Meiosis IAnimation(360 kb)Meiosis II Animation(360 kb)
Meiosis II is comparable to mitosis. However, there is no "S" phase.

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The chromatids of each chromosome room no longeridentical due to the fact that of recombination. Meiosis II separates the chromatids creating two daughter cell each through 23 chromosomes (haploid), and also each chromosome has only one chromatid.Previous | NextVocabulary The gaianation.net job > cabinet gaianation.net > Meiosis > Meiosis 1 & 2
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