Question

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.'
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Answer 1

1. Brown.

2. Brown colour is dominant.

3. 2.5 : 1

Step-by-step explanation:

The colour of Bob is brown because the offspring produced from mating are also brown. The dominant colour in these mice are brown due to presence of this brown colour in all mice. We know that dominant traits always appear in the form and structure of an organisms and we see all mice have brown colour so we can say that the dominant colour is brown. The ratio of brown to white in the 'grandchildren' are 2.5 : 1 means more mice has brown colour as compared to white.