Interaction of Y-chromosomal and autosomal gene(s) in the development of intermale aggresiion in mice

Abstract

It has been suggested that the Y chromosome of DBA/1BBg mice makes an incremental contribution to their aggressive behavior and to that of the C57BL/10 ♀×DBA/1 ♂ F ₁ hybrids. To test this hypothesis, a congenic stock of C57BL/10 with the DBA/1 Y chromosome was developed by the backcross system of breeding; the stock is designated C57BL/10-Y ¹ . There were no significant differences in aggressive behavior between the congenic C57BL/10 and C57BL/10-Y ¹ . However, the hybrid B10D1 F ₁ and D1B10-Y ¹ F ₁ had identical aggression scores, and both of these were more aggressive than the hybrid D1B10 F ₁ . These findings support the hypothesis that there is an interaction between DBA/1 Y chromosomes and autosomes in the development of intermale aggression of these mice.