A researcher had 15 pure bred wild mice which were brown and all were females. They were all mated with a male called Bob. All the offspring were brown. These were then crossed among themselves with the following results: 293 brown and 115 white.

(i). Determine the colour of Bob.
(ii). Determine which colour is dominant.
(iii). Work out the ratio of brown to white in the ‘grandchildren.’
(iv). If the researcher crosses two of the white