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Diakinesis

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diakinesis
a substage of prophase in meiosis I in which the chromosomes are maximally condensed
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...

 


Diakinesis
[Gr. dia - apart; Gr. kinesis - movement]. The last stage of prophase 1 of meiosis, leading to metaphase of the first meiotic division. The chromosomes are at maximum condensation and the nuclear membrane breaks down.

5. Diakinesis
In some organisms, the chromosomes decondense and begin to be transcribed for a time. This is followed by the chromosomes recondensing in preparation for metaphase I.

Diakinesis
The term coined by Häcker (1897) for the stage of late prophase 1 of meiosis when the chromosomes are well separated from one another (Gk. kinesis, movement; dia, apart).

[edit] Diakinesis
Chromosomes condense further during the diakinesis stage, from Greek words meaning "moving through."[1] This is the first point in meiosis where the four parts of the tetrads are actually visible.

In some organisms the chiasmata move towards the ends of the chromosome arms during late diplotene and diakinesis will then no longer correspond to that of the cross-over.

See also: Meiosis, Chromosome, Prophase, Diplotene, Metaphase

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