Crossing Over vs. Linkage
|
Crossing Over |
Linkage |
Definition |
Exchange of genes from a pair of alleles between non-sister chromatids during gamete formation. |
Closely positioned genes tend to get transferred together during gamete formation. |
Purpose |
Ensures segregation of genes to form a new pair of alleles. |
To ensure that certain closely located genes are inherited together. |
Effect of distance |
Distance between two genes is directly proportional to the possibility of crossing over. |
Distance between two genes is inversely proportional to the degree of linkage. |
Result |
It results in variation. |
It results in maintaining parental traits in the offspring. |
Significance |
Ensures separation of genes. |
Ensures inheritance of genes in their parental form. |
Effect of Age |
Increases with age. |
Decreases with age. |
Difference Between Crossing Over and Linkage
Difference Between Crossing Over and Linkage: Crossing over and linkage are two different but related events that influence the distribution of genes in the same chromosome. These two processes are seen in the case of eukaryotic cells only. On the same chromosome, the distance between two genes is directly proportional to their chance of crossing over whereas on the same chromosome, the distance between two genes is inversely proportional to their degree of linkage.