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Figure 13 | Molecular Cytogenetics

Figure 13

From: On the origin of crossover interference: A chromosome oscillatory movement (COM) model

Figure 13

Positional control of chiasma formation. Spermatocytes at the Diakinesis/Metaphase I stage from a normally fertile human male with normal mitotic karyotype (top) in comparison to that in a male with non-obstructive azoospermia (bottom). Note the extremely low number of chiasmata in the spermatocyte from the azoospermic male; some chromosomes lack chiasmata altogether (I) while two relatively large bivalents show a single chiasma a medial position (arrowed, left). There are also a number of univalents (arrow heads) as well as two bivalents with two chiasmata (arrowed, right). Reproduced from [156].

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