An inbred strain of plants has a mean height of 24cm. A second strain of the same species also has a mean height of 24cm. When these plants are crossed the F1 are also 24cm in height.However, when the F1 are crossed the F2 plants show a wide range of heights, the greatest number are similar to P1 and F1 but apprx. 4 out of 1000 are only 12cm tall and 4 of 1000 are 40cm tall. What fraction of the F2 plants will be apprx. 28cm in height ?
The answer given is c).