Final answer:
When two similar mobile genetic elements insert near each other in a chromosome, the transposition mechanism can result in DNA deletion or the formation of larger genetic elements.
Step-by-step explanation:
When two similar mobile genetic elements insert near each other in a chromosome, the transposition mechanism can result in different outcomes. One possibility is that the two elements may undergo reciprocal recombination, which leads to a deletion of the DNA sequence between them. Another possibility is that the two elements may undergo non-reciprocal recombination, resulting in the movement of one element next to the other element. This can lead to the formation of a larger mobile genetic element.
For example, consider two similar mobile genetic elements A and B that inserted near each other in a chromosome. If they undergo reciprocal recombination, the DNA sequence between A and B will be deleted, resulting in the presence of only A or B. On the other hand, if they undergo non-reciprocal recombination, either A will move next to B or B will move next to A, resulting in the formation of a larger mobile genetic element AB.
Overall, the specific outcome of transposition between two similar mobile genetic elements depends on the type of recombination that occurs and the orientation of the elements. Reciprocal recombination can lead to DNA deletion, while non-reciprocal recombination can lead to the formation of larger genetic elements.