How are complementary strands of dna held together?
a) with hydrogen bonds connecting complementary bases
b) with phosphodiester bonds connecting sugars and phosphate groups
c) with hydrogen bonds connecting complementary sugars
d) with ionic bonds between sugars and phosphate groups

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.