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paramecia that live in freshwater have contractile vacuoles, while those that live
in salt water do not. why do you think this is the case?
where in the cell are might you find proteins? explain why?
where in the cell are might you find lipids? explain.

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.