Scientific observation is not a passive phenomenon: what we ‘see’ and apprehend depends on the ideas we have

Krieger also states that “scientific observation is not a passive phenomenon: what we ‘see’ and apprehend depends on the ideas we have about [what] we expect and do not expect to ‘see’ (24). This is a very important point and helps to explain why a lot of scientific research and theory creation perpetuates racism, sexism, and other forms of oppression. Please explain what this means in your own words and come up with a specific example of how this could perpetuate racism, sexism, or another form of oppression in scientific research.