Analysis of the progeny of wild mice heterozygous for the Rb(4.12) shows that fertility and segregation are normal. This study, and others with similar results, suggests that our view of the chromosomal evolution of the house mouse should be revised.
Viroux, M. C., & Bauchau, V. (1992). Segregation and fertility in Mus musculus domesticus (wild mice) heterozygous for the Rb(4.12) translocation. Heredity, 68 ( Pt 2), 131-134. https://doi.org/10.1038/hdy.1992.20 (Original work published 1992)