Table 3. Frequencies of asynapsis of X and Y chromosomes, association of X or Y chromosomes and autosomes, and association of autosome pairs in the pachytene spermatocytes of Phodopus campbelli and P. sungorus and pachytene-like spermatocytes of F1 hybrids.
| Animal | Number of observed cells | X-Ya | X//Yb | n.d.c | X or Y- Autosomesd | Autosomes-Autosomese |
|---|---|---|---|---|---|---|
| P. campbelli (n = 2) | 106 | 105 | 0 | 1 | 0 | 0 |
| 99.09 ± 1.29% | 0% | 0.91 ± 1.29% | 0% | 0% | ||
| P. sungorus (n = 2) | 147 | 147 | 0 | 0 | 0 | 0 |
| 100% | 0% | 0% | 0% | 0% | ||
| F1 (Type B) (n = 6) | 363 | 262 | 92 | 9 | 7 | 3 |
| 70.88 ± 7.87% | 26.92 ± 8.09% | 2.20 ± 2.01% | 2.30 ± 3.52% | 0.75 ± 1.25% | ||
| F1 (Type C) (n = 5) | 310 | 206 | 67 | 37 | 4 | 1 |
| 67.57 ± 8.28% | 20.26 ± 8.74% | 12.17 ± 8.75% | 2.16 ± 4.83% | 0.54 ± 1.21% |
aNumber of cells with synaptic X and Y chromosomes.
bNumber of cells with asynaptic X and Y chromosomes.
cNumber of cells in which X and Y chromosome synapsis could not be determined.
dNumber of cells that showed association between X or Y chromosomes and autosomes.
eNumber of cells that showed association between autosome pairs.
n, number of animals; frequencies are given as mean ± standard deviation.