Question 18N.2.HL.TZ0.7c
| Date | November 2018 | Marks available | [Maximum mark: 7] | Reference code | 18N.2.HL.TZ0.7c |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Explain | Question number | c | Adapted from | N/A |
Explain how evolution occurs and which factors can cause the process to be rapid.
[7]
a. evolution is a change in the heritable characteristics «of a species» ✔
b. natural selection «causes evolution» ✔
c. overpopulation/over-reproduction/more offspring «than the environment can support» ✔
d. competition «for resources/mates» ✔
e. variation in population/species ✔
f. mutation/meiosis/sexual reproduction contributes to variation ✔
g. adaptation increases chance of survival ✔
h. reproduction/offspring produced «by the better adapted/by those that survive» ✔
i. characteristics passed to offspring by reproduction/variation is heritable ✔
j. allele frequencies/number of organisms carrying a gene changes/gene pool changes ✔
k. environmental change stimulates/triggers/speeds up natural selection/evolution ✔
l. increase in rainfall/introduction of antibiotic/pollution on tree trunks/other valid example of environmental change/new selection pressure ✔
m. artificial selection/selective breeding can speed up evolution ✔
Mark points can be awarded if explained using an example.
