Question 21M.2.HL.TZ1.7c
| Date | May 2021 | Marks available | [Maximum mark: 4] | Reference code | 21M.2.HL.TZ1.7c |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Outline | Question number | c | Adapted from | N/A |
Variation in genetically inherited characteristics is the basis for evolution.
Outline the use of analogous and homologous traits in natural classification.
[4]
Analogous
a. different evolutionary origin/do not share (recent) common ancestor (despite similarities of function) ✔
b. arise by convergent evolution ✔
c. classification based on analogous traits brings together dissimilar species/is artificial ✔
Homologous
d. similar (internal) structures/pentadactyl limb/other example of homologous structures due to common ancestry ✔
e. different uses/functions ✔
f. arise by adaptive radiation/divergent evolution ✔
g. (natural) classification is based on homologous traits (not analogous) ✔
h. classification based on homologous traits has predictive values/matches evolutionary history ✔
This was well-known by stronger candidates. Weaker candidates tended to omit significant ideas or get analogous and homologous traits muddled up.
