The next type of bias is beta bias. This is where people assume that what is true for men is also true for women, so this gender is ignored. For example, the fight or flight response. Biological research is usually conducted in male animals due to female variations from hormones make the research more complicated. In the stress research, it was concluded that the results were universal. However, this was challenged and proved wrong as there was evidence for females to produce the ‘tend and befriend’ response at times of stress, due to adaption to ensure survival of offspring.