Which of these pairs of organisms are most closely related? A. Aix sponsa and Anas acuta
B. Anas discors and Anas americana
O C. Anas cyanoptera and Mycteria americana
D. Martes americana and Mycteria americana

Everything that surrounds a particular organism

Black fur(b) in guinea pigs is dominant over white fur(b). find the probability of a homozygous offspring in a cross: bb x bb. a. 0% b. 25% c. 50% d. 75% e. 100%

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.