Meiosis sex chromosomes
But what is it about the X or Y that determines sex? Before a meiotic cell divides, its two sets of chromosomes come together and cross over, or swap, segments.
12 Oct Sex chromosome behaviour fundamentally differs between male and female meiosis. In oocyte, X chromosomes synapse giving a XX bivalent.
Sex chromosome silencing in the marsupial male germ line
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Description:An identical pattern was observed for H4K20me3 Figure 8C. The staining pattern of H3K9me2 differed from the H3K9me3 and H4K20me3 heterochromatin markers, as no specific domains were associated with the XY body. We observed three types of H3K9me2 staining patterns in late pachytene spermatocytes Figure S3A without a clear link to H3. In early round spermatids Table 2 , the sex chromosome signals for histone modifications resembled those observed in late pachytene XY bodies. H3K9me2 reached higher coverage over the sex chromosomes than did H3K9me3, which was faintly present and showed stronger domains next to the H3. In the majority of spermatid nuclei H4K20me3 seemed to be faintly present over the X or Y, while this was not observed at late pachytene.
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