Basics of Natural Selection

What do the circles in the test tube represent?

How many genetic variants of E.coli were present in the culture from the initial swab?

What is triclosan?

What variants of E.coli are found on the dish grown without triclosan?

What variants of E.coli are found on the dish grown with triclosan?

Suppose the desktop swabbed earlier was cleaned with a solution containing triclosan. Would living E.coli remain?

Suppose the desktop was swabbed again after cleaning it with triclosan over a 9-month school year. When the sample was cultured only variant S was seen. Is it likely that the bacteria in the new swab were on the desk 9-months ago, or are they off-spring of the original bacteria?

Which moth color was more prevalent before 1850?

Describe the change in the percentage of light-colored moths between1850 and 1900

During the Industrial Revolution through the mid-20th century, factories and power plants, which burned coal, produced large quantities of soot and smog. Near industrialized areas, black powder covered surfaces, including the moth habitat. Which color moth would have a better chance of surviving predation (better camouflage to hide from predators) on this dark surface?