In the 1940's, while studying genetic inheritance in corn plants, Barbara McClintock discovered that segments of DNA could move
from one place to another on a chromosome and even move from one chromosome to another. The moving segments cause genetic variation and some changes are suspected to cause such genetic disorders as breast cancer and leukemia. McClintock received a Nobel Prize for her work in genetics. These movable segments are now called A) DNA sequencing. B) recombinant DNA. C) transposons or jumping genes. D) transgenic or McClintock plasmids.
The correct answer is option (C) transposons or jumping genes.
Barbara McClintock was an american cytogeneticist. In 1940s, she discovered the phenomenon of transposition brought about by the mobile genetic elements or jumping genes or the transposable elements. These jumping genes refers to a sequence of DNA which can change its position in the genome or the genetic constitution of an organism. She discovered these jumping genes in the Maize for the first time and received the nobel prize in 1983.
Jumping genes form a major portion of the eukaryotic genome. They are often responsible for mutations and associated with the duplication of the genetic material. They also cause the structural changes in the chromosomes like inversion, deletion and translocation which are called the chromosomal aberrations.
Carbon dioxide fixation in plants occurs at the STROMA. Carbon dioxide fixation is the first step in the Calvin cycle and it occur in all plants. Carbon fixation is the process by which inorganic carbon is converted to organic compounds by the plants. The process of carbon fixation converts carbon dioxide and ribulose biphosphate into 3 phosphoglycerate.
Biomass- <span>organic matter used as a fuel, especially in a power station for the generation of electricity.</span> bio-fuel- a fuel taken directly from living matter.
Thank you for posting your question here. Below are the choices that can be found elsewhere:
a. a new mutation allowed moths to survive <span>b. the light moths had an advantage </span> <span>c. the phenotype frequency changed </span> <span>d. moths learned to adapt to their environment </span> The answer is C