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Lampbrush


Lampbrush chromosomes occur in a limited phase of meiosis during oogenesis in amphibian oocytes.
The lampbrush chromosome is a bivalent (2 pairs of sister chromatids held together by chiasmata).
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Chromosomes of amphibian oocytes having loops suggestive of a lampbrush. Large chromosomes found in amphibian eggs, with lateral DNA loops, extending from chromomeres, producing a brushlike appearance under the microscope.
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Example: Lampbrush Chromosomes
The meiotic cells (oocytes) of some amphibians (frogs, toads, salamanders) have chromosomes that appear bristled. The bristles are loops of unwound DNA with many RNA polymerase and mRNA molecules.
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