Table 2.
Progeny of the double heterozygotes
| Genotype | No. of pups | Observed frequency | Expected number | Expected frequency |
|---|---|---|---|---|
| Usf1(+/+)/Usf2(+/+) | 19 | 0.067 | 18 | 0.062 |
| Usf1(+/+)/Usf2(+/−) | 61 | 0.214 | 36 | 0.125 |
| Usf1(+/+)/Usf2(−/−) | 12 | 0.042 | 18 | 0.062 |
| Usf1(+/−)/Usf2(+/+) | 47 | 0.164 | 36 | 0.125 |
| Usf1(+/−)/Usf2(+/−) | 100 | 0.351 | 71 | 0.250 |
| Usf1(+/−)/Usf2(−/−) | 0 | 0 | 36 | 0.125 |
| Usf1(−/−)/Usf2(+/+) | 22 | 0.077 | 28 | 0.062 |
| Usf1(−/−)/Usf2(+/−) | 24 | 0.084 | 36 | 0.125 |
| Usf1(−/−)/Usf2(−/−) | 0 | 0 | 18 | 0.062 |
All 285 pups from 56 litters produced by 19 breeding pairs of Usf1(+/−)/Usf2(+/−) mice were genotyped by tail DNA analysis. There were no sex differences among the pups of the various genotypes.