Significance of Crossing Over :

1. Crossing over leads to new combinations of genes and thus, produce genetic variability in sexual reproducing organisms.
2. Variability in population forms the basis of evolution.
3. Percentage of crossing over is used in calculating the distance between genes in locating the genes on chromosomes and in determining their sequence.
4. Useful recombinations are picked up by plant breeders and animal breeders for developing improved varieties.
5. It provides evidence that genes are arranged in a linear order in the chromosomes.
6. Chromosome maps are prepared by help of crossing over.