We were told by a Senior Marker that markers will mark everything on exam paper. They will even look at the little diagrams and stuff you may have drawn to see if that demonstrates you understand the question. Say if there is a question like describe the results of the F2 generation between two heyterozygous crosses. You then draw punnet squares, but then you dont exactly communicate the proper reasons for the ratios in your written answer, you may still be able to get one mark becasue you have demontrsated how it works..