Derivation-dependent Distribution of Insertion Sites for a Drosophila Transposon (original) (raw)
Excerpt
An organism may not only be considered as an end product of a long evolution, but also as a mediator of the genetic material in the DNA molecules to the following generations. The chromosomes have to be transmitted to the next generation without any essential damage to their efficiency. This means that many gene mutations and especially large rearrangements, such as reciprocal translocations, will be discarded in the selective procedure that serves as a guard of continuity. for Drosophila, it also means that different species often have the same gene order in the homologous chromosome arms. Most of the differences found have been ascribed to centric fusion of different arms and to pericentric and paracentric inversions (Stone 1956). The small changes may have a better chance to be taken care of by natural selection and to survive for many generations. Small changes are such things as mutations and duplications of...