When biologists study natural selection they are looking for changes in genotype or allele frequencies across generations in the real world. based on the thinking you have just done about plant growth, density, and neighbors, which experimental treatment(s) is (are) most likely to give you information about relative fitness of the two morphs that would apply to nature? why?

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.