text: In Drosophila, the P element transposon effects the "insertional" type of this process.
full_question: In Drosophila, the P element transposon effects the "insertional" type of this process. A population's expected heterozygosity depends on population size and the rate of this process. Two types of this process are notated using a greater than sign and an uppercase delta. This process is called "dominant negative" if the product antagonizes the (*) wild-type. Muller's ratchet explains that populations reproducing asexually experience deleterious forms of this process way more than populations reproducing sexually. Silent, missense, and nonsense forms make up the "point" type of this process, and insertions and deletions comprise the more serious "frameshift" form. For 10 points, name these permanent changes in the nucleotide sequence of an organism.
first_sentence: In Drosophila, the P element transposon effects the "insertional" type of this process.
raw_answer: mutations [or mutagenesis; or insertional mutation; or silent mutation; or missense mutation; or nonsense mutation; or point mutation; or frameshift mutation; accept insertions before mentioned; accept deletions before mentioned] 