For a given cross, the expected number of double recombinants is 20 and the observed number of double recombinants is 15. What is the coefficient of coincidence (c)?
A) 0.25
B) 1.33
C) 20
D) 0.75
E) 15
D
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A positive antibody titer indicates
A) previous exposure to an antigen. B) active infection. C) latent disease. D) a healthy individual.
Which subatomic particles of a pigment absorb light?
a. electrons only b. protons only c. neutrons only d. electrons and protons e. protons and neutrons
While hiking through the woods on your day off, you find a dead tree that is nevertheless covered in leaves. Closer examination reveals that the leaves belong to a vine that has attached itself to the dead tree’s branches and has no contact with the soil below. What type of roots does this vine possess?
a. tap b. fibrous c. epiphytic d. adventitious
Why are correlations less convincing than controlled experimental results?
A) Correlations are subject to greater bias than experimental results. B) Correlations cannot be observed outside the laboratory. C) Correlations cannot be statistically significant. D) Correlations do not eliminate as many alternative hypotheses.