Answer:
Meiotic arrest at
diplotene stage commonly occurs in mammalian occytes. In females, meiosis
starts in the embryo and proceeds as for as diplotene, when the chromosomes become
diffused and the cells are referred to as being in the dictuate stage. This
arrest is under hormonal control.
In many amphibian oocytes
binds and insects with a long period of immaturity, the oocyte may be arrested
in the dictyate stage for many years and spend a prolonged period in diplotene.
This stage is
characterised by formation of lampbrush chromosomes where intense RNA synthesis
occurs and most of the genes in the DNA loops are actively transcribed and expressed.
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