Biology, 07.03.2020 02:22 andrecoral105
An evolutionary biologist hypothesizes that two morphologically similar plant species are not closely related. To test the hypothesis, the biologist collects DNA samples from each of the two plant species and then uses restriction enzymes to cut the DNA samples into fragments, which are then subjected to gel electrophoresis. The results are shown in Figure 1.
The figure shows a rectangle representing a gel with 2 lanes, labeled Species A and Species B. On the right side of the rectangle is the label, Direction of Movement, with a vertical arrow pointing downward. An open rectangle at the top of each lane represents the sample loading well. The data from the representation of the gel are as follows. Lane A contains 12 dark narrow rectangles, representing bands in the gel. The first band is near the top, just below the sample loading well. The next nine bands are fairly evenly spaced from close to the top band to about three fourths of the way along the lane. Two bands below these top ten are spaced a bit further apart and are in the next one eighth of the lane. No bands are in the final eighth of the lane. Lane B contains 9 bands. The first band of lane B is in a position that is just below the second band of lane A. Two more bands are below the first band, then there is a space with no bands that is approximately at the second one fourth of the lane. Five more bands are in the second half of the lane, the first two a bit spread out and the next three closer together. The last band in lane B is in a position that is lower than that of the last band in lane A.
Figure 1. DNA analysis of two species
Given the results shown in Figure 1, which of the following correctly describes a relationship between the two species?
Answers: 2
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An evolutionary biologist hypothesizes that two morphologically similar plant species are not closel...
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