Which of these best describes genetic drift?
a. decrease in mutation rate
b. selection of favorable genes
c. increase in species adaptation
d. random change in gene frequency

Genetic drift is a change in the frequency of alleles in a population as a result of random sampling of organisms. For example, imagine you have two different alleles in the population responsible for white and purple color of a flower. Their allele frequencies are 0.6 for white flowers and 0.4 for purple flowers. After some change in the environment, only purple flowers survive. They will reproduce, and in the population there will be only purple flowers. The population for these flowers will increase from 0.4 to 1.

micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called