Overaeration lungs: Hyperaeration means lungs contain larger amount of air than normally expected. Has many causes. In children can be seen with diseases causing air trapping such as bronchiolitis, asthma, cystic fibrosis, congenital heart disease, early aspiration, and metabolic acidosis.
Barbara McClintock's World Discovering Jumping Genes For the first half of the 20th century, genes were seen as objects with fixed positions on the chromosomes. However, in the 1950s, Barbara McClintock showed that certain DNA fragments, termed transposons, can be activated to jump from one position on a chromosome to another.
These mobile segments of DNA are sometimes called jumping genes . 1  Class II transposons. 2  Class I transposons. 3  first transcribe the DNA into RNA and then. 4  use reverse transcriptase to make a DNA copy of the RNA to insert in a new location.etrotransposons also move by a  copy and paste  mechanism but in contrast to the transposons described above, the copy is made of RNA, not DNA. The RNA copies are then transcribed back into DNA â using a reverse transcriptase â and these are inserted into new locations in the genome.