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Table 1 Synapsed or unsynapsed quadrivalents and their binding to the XY chromosomes

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

Rb heterozygote
Male 2n = 38
Examined spermatocytes Synapsed quadrivalents Unsynapsed quadrivalents
Bound to XY Not-bound to XY Bound to XY Not-bound to XY
Animal 1 16 0 6 8 2
Animal 2 16 0 7 9 0
Animal 3 13 0 5 7 1
Animal 4 15 0 8 7 0
Total 60 0% 26 (43%) 31 (52%) 3 (5%)