Identify the location of the central canal in the spinal cord slide.

pic: cross section of a spinal cord with four labels. label a is on the area surrounding the dorsal and ventral horn, label b is on the purple shaded area inside the dorsal and ventral horn, label c is on the dorsal root, and label d is on the opening in the middle of the cross section.

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.