Unit 7: Natural Selection
Biology · Unit 7 · Paper 1

Natural Selection unit test

A test on this unit alone, marked as a percentage and a letter grade — for the test your class is actually sitting, rather than for May. Answer everything, then submit once: seeing the answer to question 3 before attempting question 4 makes the final percentage meaningless.

Paper 1Paper 2Paper 3
Each paper is built from this unit’s 38 terms and is the same for everyone, so a teacher can assign “Unit 7, Paper 1” and every student sits the identical test. Multiple choice is marked objectively; the written sections you mark yourself against the model answer and rubric.
Suggested time 31 min 28 points0/17 attempted
1

Heritability requirement

2

Phylogenetic tree

3

Evidence for evolution

4

Directional selection

5

Convergent evolution

6

Antibiotic and pesticide resistance

7

Speciation

8

Natural selection

9

Lab: Hardy-Weinberg modeling

10

Out-group in a cladogram

11

Artificial selection

12

Adaptive radiation

Short answer 1. Define or explain: Disruptive selection

3 pts

Short answer 2. Define or explain: Fitness

3 pts

Short answer 3. Define or explain: Coevolution

3 pts

Short answer 4. Define or explain: Cladogram and shared derived characters

3 pts

Free response

4 pts

Two populations of a flowering plant grow on opposite sides of a mountain range. A botanist transplants seeds from each population into a common garden and finds that plants from the two populations flower three weeks apart and produce almost no viable seed when cross-pollinated.

(a) Identify whether the reproductive barrier described is prezygotic or postzygotic for the difference in flowering time, and justify your answer.

(b) Explain the significance of growing both populations in a common garden.

(c) Explain how the mountain range could have contributed to the divergence of these two populations.

(d) Describe the evidence that would be needed to conclude that the two populations are separate species.