Which statements describe hydrotropism? Check all that apply.

Hydrotropism is a plant’s response to light.
Hydrotropism is a plant’s response to an external stimulus.
Hydrotropism causes cells to grow longer on one side of the roots.
Hydrotropism causes cells to grow longer on one side of the stems.
Hydrotropism causes a plant to grow toward light.
Hydrotropism causes a plant to grow away from light.

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.