... another factor that may contribute to antisocial acts. The estrogen-receptor gene is also attributed to mice sexual rampages. Disruption of this gene is experiments showed an almost complete shutdown of sexual behaviour in males. Absence of the 'ERa' and 'ERß' gene in male mice caused them to be unresponsive to highly receptive females, either by mating attempts or making the ultrasonic vocalisation that normally accompanies pre-mating behaviour. Sparrow mating calls are also slightly due to their inherited genes from their parents. Within the same species, there are regional variations in bird song. These differences could be interpreted as evidence for a genetic basis. Putting aside environmental influences such as learning the dialect from adults in the area, infant chicks were born with a crude template of what their species song sounds like, which remained the same in an isolated environment. Once again, this shows a slight extent to gene factors ...

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