Which statement best explains why electrical signals in the body are often based on ions? a.) ions contain a single atom. b.) ions can gain electrons. c.) ionic bonds are very strong. d.) ions are charged particles.

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.