Q. Jordan Townsend TA: Mendelian Genetics 1. To be subject to evolution by natural selection a trait must be transmitted reliably from parent to offspring. A. In Darwin's day, people believed in a "fluid" or "blending" model of heredity. Explain why would such a system not support evolution by natural selection? For those people that believed in fluid or blending method of heredity must be aware that it does not support evolution by natural selection because it is simply not natural. When blending occurs, it stays away from illustrate what offspring is supposed to become if y had gone through natural selection instead of something that is virtually another form of artificial selection. B. Explain how does behaviour of Mendelian genes differ from this blending model?