Zygotene: Difference between revisions
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[[Meiosis prophase 1|Prophase I]] of [[Meiosis prophase 1|meiosis]] is split into five stages. Zygotene is the second stage in this process. It comes right after the leptotene stage (stage 1) in which | [[Meiosis prophase 1|Prophase I]] of [[Meiosis prophase 1|meiosis]] is split into five stages. Zygotene is the second stage in this process. It comes right after the leptotene stage (stage 1) in which chromatin fibres begin to condense. During the zygotene stage, condensation continues to make distinguishable chromosomes. [[Homologous chromosomes|Homologous chromosomes]] also begin to pair up with one another through the process of synapsis to form [[Bivalent|bivalents]] (or the [[Synaptonemal Complex|synaptonemal complex]]). | ||
[[Crossing over|Crossing over]] is possible once the homologous chromosomes are in close proximity with one another. This is important as the exchange of genetic information between corresponding regions of the homologous chromosomes is crucial to producing variation in a population. <ref>Hardin J., Bertoni G., Kleinsmith L.J. (2012) Becker's World of the Cell, 8th Edition, San Francisco: Benjamin Cummings, p.605</ref> | [[Crossing over|Crossing over]] is possible once the homologous chromosomes are in close proximity with one another. This is important as the exchange of genetic information between corresponding regions of the homologous chromosomes is crucial to producing variation in a population. <ref>Hardin J., Bertoni G., Kleinsmith L.J. (2012) Becker's World of the Cell, 8th Edition, San Francisco: Benjamin Cummings, p.605</ref> | ||
Revision as of 07:21, 29 November 2013
Prophase I of meiosis is split into five stages. Zygotene is the second stage in this process. It comes right after the leptotene stage (stage 1) in which chromatin fibres begin to condense. During the zygotene stage, condensation continues to make distinguishable chromosomes. Homologous chromosomes also begin to pair up with one another through the process of synapsis to form bivalents (or the synaptonemal complex).
Crossing over is possible once the homologous chromosomes are in close proximity with one another. This is important as the exchange of genetic information between corresponding regions of the homologous chromosomes is crucial to producing variation in a population. [1]
References
- ↑ Hardin J., Bertoni G., Kleinsmith L.J. (2012) Becker's World of the Cell, 8th Edition, San Francisco: Benjamin Cummings, p.605