AP BIOLOGY

Detailed explanation-1: -Which of the following about the P-element is false? Explanation: The P-element in Drosophila is one of the best examples of transposable elements in eukaryotes. This element is 2907 bp long and features a 31 bp inverted repeat at each end. This element encodes a transposase.

Detailed explanation-2: -P elements are cut-and-paste transposons in the genomes of Drosophila melanogaster and several other Drosophila species. The transposition of these elements is catalyzed by an enzyme, the transposase, which is encoded by the structurally complete members of the P-element family.

Detailed explanation-3: -DNA transposons, also known as class 2 transposable elements, are flanked at both ends by terminal inverted repeats. The inverted repeats are complements of each other (the repeat at one end is a mirror image of, and composed of complementary nucleotides to, the repeat at the opposing end).

Detailed explanation-4: -P elements are transposable elements that were discovered in Drosophila as the causative agents of genetic traits called hybrid dysgenesis. The transposon is responsible for the P trait of the P element and it is found only in wild flies. They are also found in many other eukaryotes.