Scientists use a technique called to make multiple copies of DNA sequences. Scientists can also make by combining DNA from two different sources. One of the sources may be bacteria, which have circular DNA molecules called When bacteria undergo transformation, they can be identified by . 1. gel electrophoresis
DNA ligation
recombinant DNA
the polymerase chain reaction (PCR)

2. plasmids
polyploidy
messenger RNA
recombinant DNA

3. polyploidy
recombinant DNA
plasmids
telomeres

4. nucleotides
genetic markers
telomeres
polyploidy

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.

If water were a non polar molecule, how would its properties be different ? a.) water would be a much lighter molecule b.) water would be able to climb up inside plants c.)water would not be able to form hydrogen bonds d.) water would stick together much more strongly