A cell membrane is semi-permeable. What does that mean? Select one:
a. It lets things in, but not out of the cell.
b. It let things out, but not into the cell.
c. It Lets certain things in and certain things out of the cell

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.