Gene mutation is a change in the nucleotide sequence, in a particular gene, whereas chromosomal mutation is a change in several genes, in the chromosome. ... Gene mutation is only a slight structural alteration, whereas chromosomal mutations are either numerical or structural changes in the entire DNA strand.
I just took a test on this subject and the correct answer is D Tetrad.
The advantage of growing genetically engineered BT crops are increased crop yields, reduced pesticide use, less environmental damage, less fungal contamination and reduced labor.
Explanation:
Bt is a soil bacterium whose genome contains genes for several proteins toxic to insects. When it is sprayed on the surface of crops, Bt toxins breakdown quickly when exposed to ultraviolet light, and also wash them in a strong rain.
They offers environmental and economic benefits to farmers with increased crop yields, reduced pesticide use, less environmental damage, less fundamental contamination, and reduced labor.
Thus the advantages of growing genetically engineered Bt crops over spraying Bt on the crops include lower production cost,less pest problems, and better yields.
Answer: Older fossils usually are found in the deepest strata.
Explanation: The deeper the fossils are in the ground, the older that they are. The reason is because layers of dirt, sand, and rock cover the fossils, and because they have been around for millions of years, it would give it all the time to cover up the fossils.
Biochemical tests and use of media allow physicians to identify
the type of bacteria causing a disease (such
as whether its gram+ or gram-) and use appropriate
antibiotic effective against the bacteria. Another clinical significance is to
determine the resistance of bacteria to antibiotics (this is conducted using susceptibility tests).