Table 1.
The relationship between the number of nucleoli, 45S rRNA gene copies, parental genome, and expression proportions (SR, sex-reversed).
| mother | father | nucleoli/cell | gene copy no. ± s.e. | L rDNA % ± s.e. | M rDNA ± s.e. | B rDNA % ± s.e. | L rRNA % ± s.e. | M rRNA % ± s.e. | B rRNA % ± s.e. |
|---|---|---|---|---|---|---|---|---|---|
| X. laevis (L) | X. laevis (L) | 2 | 761 ± 7 | 100 | 0 | 0 | 100 | 0 | 0 |
| X. muelleri (M) | X. muelleri (M) | 2 | 486 ± 8 | 0 | 100 | 0 | 0 | 100 | 0 |
| X. borealis (B) | X. borealis (B) | 2 | 686 ± 13 | 0 | 0 | 100 | 0 | 0 | 100 |
| X. laevis (L) | X. muelleri (M) | 1 | 335 ± 4 | 20 ± 0.04 | 80 ± 0.04 | 0 | 96 ± 0.01 | 4 ± 0.01 | 0 |
| X. muelleri (M) | X. laevis (L) | 1 | 334 ± 36 | 23 ± 0.10 | 77 ± 0.10 | 0 | 4 ± 0.00 | 96 ± 0.00 | 0 |
| X. laevis (L) | X. borealis (B) | 1 | 418 ± 5 | 10 ± 0.01 | 0 | 90 ± 0.01 | 97 ± 0.19 | 0 | 3 ± 0.68 |
| X. borealis (B) | X. laevis (L) | 1 | 218 ± 8 | 10 ± 0.02 | 0 | 90 ± 0.02 | 9 ± 0.01 | 0 | 91 ± 0.01 |
| F1(L × M) | X. laevis (L) | 1 | 427 ± 0 | 46 ± 2.40 | 54 ± 2.40 | 0 | 98 ± 0.600 | 2 ± 0.600 | 0 |
| F1(L × M) | X. muelleri (M) | 1 | 313 ± 5 | 25 ± 1.07 | 75 ± 1.07 | 0 | 83 ± 0.564 | 17 ± 0.564 | 0 |
| SR F1(L × M) | X. muelleri (M) | 1 | 400 ± 21 | 19 ± 1.80 | 81 ± 1.80 | 0 | 77 ± 2.470 | 23 ± 2.470 | 0 |
| F1(L × B) | X. laevis (L) | 1 | 306 ± 36 | 59 ± 2.40 | 0 | 41 ± 2.400 | 100 ± 0.010 | 0 | 0 ± 0.010 |
| F1(L × B) | X. borealis (B) | 1 | 356 ± 16 | 18 ± 1.40 | 0 | 82 ± 1.400 | 97 ± 0.541 | 0 | 3 ± 0.541 |
| F1(B × L) | X. laevis (L) | 1 | 240 ± 23 | 84 ± 2.60 | 0 | 16 ± 2.600 | 98 ± 0.100 | 0 | 2 ± 0.100 |
| F1(B × L) | X. borealis (B) | 1 | 260 ± 18 | 13 ± 4.40 | 0 | 87 ± 4.400 | 56 ± 0.560 | 0 | 44 ± 0.560 |
| F1(L × M) | X. borealis (B) | 1 | 355 ± 14 | 3 ± 0.70 | 5 ± 0.700 | 92 ± 0.300 | 91 ± 1.800 | 3 ± 1.000 | 6 ± 1.000 |