The atomic mass of the most common isotope of carbon is
the element with an atomic number of 4 is
exist in orbitals around the nucleus.
oxygen has protons in the nucleus.
an isotope of an element has the same number of protons but a different number of

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.