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Table 2 Combination of associated and single metacentric/telocentric bivalents per nucleus observed in 2n = 24 spermatocytes

From: Robertsonian chromosomes and the nuclear architecture of mouse meiotic prophase spermatocytes

Combinations between 8 metacentric bivalents Combinations between 3 telocentric bivalents Metacentric/Telocentric associations Number of spermatocytes per nuclear combination % of spermatocytes per Class
8-0 - - -   0 0
7-1 2(3); 5(2-1)   7 7
6-2 3(3); 2(2-1)   5 12
6-1-1 2(3); 5(2-1) 1(1M2T) 7
5-3 1(1-1-1) 1(3M1T) 1 8
5-2-1 1(3); 3(2-1)   4
5-1-1-1 2(3);1(1-1-1)   3
4-4 1(2-1);2(1-1-1)   3 31
4-3-1 3(3); 9(2-1); 1(1-1-1)   13
4-2-2 2(3); 3(2-1); 1(1-1-1) 1(2M2T) 6
4-2-1-1 2(3); 4(2-1); 2(1-1-1) 1(1M1T) 8
4-1-1-1-1 1(1-1-1)   1
3-3-2 1(3); 4(2-1); 2(1-1-1) 1(1M1T) 7 38
3-3-1-1 3(3); 4(2-1); 3(1-1-1) 1(3M1T) 10
3-2-2-1 4(3); 8(2-1); 2(1-1-1) 1(1M1T) 14
3-2-1-1-1 1(3); 4(2-1); 1(1M1T) 5
3-1-1-1-1-1 2(2-1) 1(3M1T) 1(1M1T) 2
2-2-2-2     4
2-2-2-1-1 1(3): 2(2-1);1(1-1-1) 1(2M2T);1(1M1T) 4
2-2-1-1-1-1    
2-2-1-1-1-1    
2-1-1-1-1-1-1    
1-1-1-1-1-1-1-1     0
TOTAL 27(3); 56(2-1); 17(1-1-1) 12 100 100
  1. 100 nuclear microspreadings from 2n = 24 spermatocytes were examined.The SC and the pericentromeric heterochromatin were identified by immunochemistry using, respectively, anti-SYCP3 and anti-H3K9me3 antibodies (as in Figure 4c & d).
  2. The first column shows the combination of associated and single metacentric bivalents per nucleus; The 2nd column the combination of associated and single between 3 telocentric bivalents; the 3th column the spermatocytes that showed associations between metacentric and telocentric bivalents; The 4th column the frequency of spermatocytes per nuclear combination; and the 5th column the frequency of spermatocytes per Class, considering as such, all the nuclei sharing the same highest combination of metacentric bivalent.
  3. For example the third line of this Table means: In 5 spermatocytes the metacentrics were in a group of 6 and in another of two bivalents. In 3 of these spermatocytes the telocentrics were all together and in 2 they were in a combination 2 together and one alone. 12 spermatocytes were Class 6 or 12 had 6 as the higher number of associated metacentric bivalents.