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Fig. 2 | Biological Research

Fig. 2

From: Synaptic configuration of quadrivalents and their association with the XY bivalent in spermatocytes of Robertsonian heterozygotes of Mus domesticus

Fig. 2

a Nuclear configuration of a synapsed quadrivalent not associated with the XY bivalent: the synaptonemal complexes of the chromosomes involved are represented. Chromosomes: 11 in blue, Rb 11.16 in blue and green, Rb 16.17 in green and purple and 17 in purple. The respective centromeres are coloured orange. The quadrivalent’s four synapsed telomeres, all bound to the nuclear envelope, are indicated as T1, T2, T3 and T4. The pericentromeric heterochromatin of the quadrivalent and the condensed sex chromatin are shaded in grey. TXY: region of synapsis between chromosomes X and Y. tX: single axis of the X chromosome; tY: single axis of the Y chromosome. b Nuclear configuration of an unsynapsed quadrivalent associated with the XY bivalent. The synaptonemal complexes or single axes of the chromosomes involved are represented. Chromosomes: 11 in blue, Rb 11.16 in blue and green, Rb 16.17 in green and purple and 17 in purple. The respective centromeres are colored orange. The pericentromeric heterochromatin of the quadrivalent is continuous with the condensed sex chromatin, both shaded in grey. The quadrivalent’s three synapsed telomeres (T1, T2, T3) and the single telomeres (t) are independently bound to the nuclear envelope; one of these axes is connected to the single axis of the X chromosome (tX). TXY: region of synapsis between chromosomes X and Y. tY: single axis of the Y chromosome

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