The ecosystem is the lowest level of the biosphere hierarchy to include
a.
the animal species present
b.
weather patterns and soil conditions
c.
interactions between different species
d.
the plant species present

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.