Farmers that select for breeding only trees that produced the largest fruit or cows that produced the most milk would be an example of
a. artificial selection
b. inherited variation
c. artificial breeding
d. artificial variation

4. multiple crosses were made between true-breeding lines of black and yellow labrador retrievers. all the f1 progeny were black. when these progeny were intercrossed, they produced an f2 consisting of 91 black, 39 yellow and 30 chocolate. a. propose an explanation for the inheritance of coat color in labradors. b. propose a biochemical pathway for coat color determination and indicate how the relevant genes control coat coloration.