Noun
blending inheritance (uncountable)
(biology, historical) The obsolete theory that progeny inherits any characteristic as the average of the parents' values, so for example crossing a red and a white variety of flower would yield pink-flowered offspring.
But with blending inheritance, genetic variance would be rapidly lost, making evolution by natural selection implausible. Source: Internet
Various hereditary mechanisms, including blending inheritance were also envisaged without being properly tested or quantified, and were later disputed. Source: Internet