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.
Discovering Addiction Genes. Many genes with roles in addiction were identified with the help of animal models, especially mice. Because the reward pathwayâand many of the genes that underlie itâfunctions in much the same way in mice as it does in people, mice are leading the way in identifying addiction genes. When researchers discover a gene that plays a role in addiction in a model organism, such as mouse or fruit fly, they can then identify the counterpart gene in humans by looking for similar DNA sequences. To the right, you will find a sampling of some of the genes suspected to play a role in addiction, many of which were identified first in animals. 1  The A1 allele of the dopamine receptor gene DRD2 is more common in people addicted to alcohol or cocaine.