Plants in the tundra are very small or have hairy coverings because: A:they need to conserve water in the extremely dry climate.

B:the cold climate prevents them from growing larger.

C:the wet, marshy soil slows their growth.

D;All of these choices are correct.​

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.