PSY 3061 Chapter Notes - Chapter 2: Phenylalanine Hydroxylase, Selective Breeding, Intellectual Disability
Document Summary
Tryon (1934) showed the selective breeding works for behavioral traits o. Trained heterozygous rats to run a complex maze by providing a food reward when they reached the goal box. Maze-bright: entered incorrect parts of the maze less often. Maze-dull: entered incorrect parts of the maze more often: bred maze-bright with maze-bright ad maze-dull with maze-dull. The worst of the maze-bright strain made less errors than the best of the maze-dull strain. Had the maze-bright offspring raised by the maze-dull parents and vice versa. Made no difference in the results; maze-bright was still producing fewer errors than maze-dull. Almost any behavioral trait can be selectively bred o. Selectively breeding for one behavioral trait often brings along other behavioral traits as well. The genes responsible for one behavioral trait are also responsible for other behavioral traits. Searle (1949) used behavioral tests to compare maze-bright and maze-dull rats. Suggested that maze-bright rats are not more intelligent but less fearful.
