Biology Now, 2e

Navel Gazing ■ 283

doi:10.1371/journal.pone.0047712.t001

2,188 1–10

97 11–20

31 21–30

12 31–40

17 41–50

11 51–60

4 91–100

2 81–90

2 71–80

4 61–70

Phylotypes

Percentage of Human

Samples Where Found

Leveling Up

(^12) Doing science The research discussed in this chapter would
not have been possible without the many citizen scientists who
shared samples of their belly button microbes with the research
team. Choose a citizen science project: Perform an Internet search
on the term “citizen science project,” or find regularly updated lists
of projects at Scitable (http://www.scitable.com) and Your Wild
Life (http://www.yourwildlife.org). Write a one-paragraph summary
of the goals of the project you have chosen. Would you participate
in this project? Why or why not? Describe a citizen science project
that you would want to contribute to.
(^13) Looking at data The table here is based on the published
results of the study discussed in the chapter. It shows the number
of bacterial phylotypes (kinds of bacteria) that were found on a
particular percentage of people.
a. How many bacterial phylotypes were found on only 10 percent
or fewer of the people sampled? How many were found on more
than 90 percent of people?
b. How many phylotypes were found on more than half of the
people sampled?
c. Describe in one or two sentences the frequency of
phylotypes found in the study. Were most phylotypes
rare or common?
For more, visit digital.wwnorton.com/bionow2 for access to:
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