Selection doesn't work in completely inbred plants because inbreds lack genetic variability.
Section can only work on genetic variation.
The F1 has no genetic variation, just like the inbred parents. The F1's are heterozygous, but they are all the same genetically, which is another way of saying that they have no genetic variance. Since we just calculated V E , the total variance for an inbred population will be 4.7. Thus, the next generation will have a mean length of 12.6 cm. To get the genotype frequencies, divide the number of each type by the total number.