Crime-scene work often involves obtaining a DNA sample from a drop of blood to help identify persons who may have been involved. Frequently, the size of the DNA sample is extremely small, too small for easy analysis. Which of the following laboratory procedures could criminologists use to amplify the amount of DNA present? a
Cloning and gel electrophoresis

b
Cloning and polymerase chain reaction (PCR)

c
DNA splicing and polymerase chain reaction (PCR)

d
Vector amplification and DNA splicing

20 in the formula no3, what does the subscript 3 mean?

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

The graph shows the area of forest cover in various regions of the world through a forest station forest habitats have been established in areas that previously didn't have forest and with geographic region has this approach been most successful