Biology 1407. TAMU-CC.
13 February 2008. MWF 1:00. 1-12 = 4 points each.
I often hear people say something like “Science only deals with proven facts.
Evolution is not a proven fact.
Evolution is only a theory.”
This line of reasoning is very
common among the general public.
However, this line of reasoning indicates a
misunderstanding of the nature and logic of science.
Science depends on “if, then”
Hypotheses of this type of syllogism cannot be proved to be true
a. a true prediction can be derived from a false hypothesis
this is why science cannot
prove anything to be true.
Please see the truth table presented in lecture.
b. a true prediction can be derived from a true hypothesis
c. a false prediction can be derived from a false hypothesis
d. a false prediction can be derived from a true hypothesis
e. none of these choices
Which of the following could be subject to natural selection?
a. little finger shape in humans (bends in toward the 4
finger or is straight)
b. There is genetically based variation for cold tolerance in a population of local
Plants that can survive through the winter produce 35% more seeds that do
the plants that die in December.
A population with genetically based variation that
This is by far the best choice among these choices.
, flower color is determined by the acidity of the soil.
On acidic soils,
flowers are blue.
On basic soils, flowers are red.
More pollinators come to blue flowers
than to red flowers.
Is the trait genetically determined?
I don’t think so either.
, there are several genes involved in making Rubisco.
All the plants in
the population have the same alleles at these genes to make Rubisco.
Do you see any
variation in this trait in the population?
e. natural selection would not occur in any of these cases
If you show a hypothesis to be false, is there any possible way for the hypothesis to be
If our series consists of even positive integers, then the next number is 8.
2, 4, 6, 7, ooops.
There is NO way that this hypothesis could be true.
If you show a hypothesis to be true, is there any possible way for the hypothesis to be
2, 4, 6, 8
OK, the hypothesis is true.
However, we don’t know every number.
Maybe later you have 2, 4, 6, 8, 10, 12, 14, 16, 17
a. yes; yes
b. yes; no
c. no; no
d. no, yes