Question 19N.2.HL.TZ0.3
| Date | November 2019 | Marks available | [Maximum mark: 5] | Reference code | 19N.2.HL.TZ0.3 |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Describe, Outline | Question number | 3 | Adapted from | N/A |
Describe what is shown in a cladogram.
[2]
a. similarities/differences between organisms/species/clades ✔ mpa and mpd concern actual characteristics, not evolutionary relationships.
b. «probable» evolutionary relationships/closeness/common ancestry/phylogeny ✔ mpb concerns such relationships
c. divergence/splits/speciation/branches/nodes ✔ mpc concerns the structure branching of the cladogram
d. relative similarity/differences between base sequence/amino acid sequence ✔
Outline how variation in organisms of the same species could lead to natural selection.
[3]
a. survival of the better adapted/fittest ✔
b. more reproduction of better adapted/fittest/individuals with favorable variations ✔
c. genes for favorable variations/adaptations passed on to offspring ✔ Accept answers in the converse.
d. competition for resources/more offspring produced than the environment can support/a struggle for existence ✔ Accept answers in the converse.
