The correct statement about the illustration would be that genetic variation within chromosomes has increased.
The genetic variation of a chromosome refers to variation in the gene sequence on the chromosome.
In the tetrad, one of the chromosomes has AABB genes on it while the other chromosome has aabb genes on it.
After the crossing over of chromosomal segments, the genes on the first chromosome became AABb while that on the second chromosome became aaBb. Chromosomal segments containing B and b genes have been switched between the two chromosomes respectively.
Thus, the number of genes on each chromosome has increased leading to an increase in genetic variation.
More on genetic variation can be found here: https://brainly.com/question/1619951