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Zygotene


Zygotene
[Gr. zygotos - yoked together; Gr. tainia - ribbon]. The second stage in prophase 1 of meiosis, characterized by the synapsis, or pairing, of homologous chromosomes to form a bivalent.
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Zygotene
The term proposed by Gregoire (1907) to describe the nuclei at a particular stage of prophase 1 of meiosis when the homologous chromosomes are associating side by side. (Gk. zygon, yoke; taenia, ribbon.)
Pachytene ...
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2. Zygotene
Synapsis. The synaptonemal complex begins to form.
DNA strands of nonsister chromatids begin the process of recombination. How they are able to do so across the synaptonemal complex, which is over 100 nm thick, is unknown.
3. Pachytene ...
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The zygotene stage sees the completion of synapsis. The combined homologous chromosomes are said to be bivalent, a reference to the two homologous chromosomes. They may also be referred to as a tetrad, a reference to the four sister chromatids.
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late zygotene . . . pachytene
diplotene
Axial elements begin to decorate chromosomal fibers.
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Zygotene: The synaptonemal complex is formed (central and lateral elements) pairing homologous chromosomes, 1% of DNA that wasn't replicated during the S phase replicates.
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A proteinaceous complex that apparently mediates synapsis during zygotene stage and then disintegrates. A complex structure that unites homologous chromosomes during the prophase of meiosis.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
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