DP Biology (first assessment 2025)
Question 19N.2.HL.TZ0.5b
| Date | November 2019 | Marks available | [Maximum mark: 4] | Reference code | 19N.2.HL.TZ0.5b |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Outline | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 4]
19N.2.HL.TZ0.5b
(b)
Outline the principles used by scientists to classify organisms.
[4]
Markscheme
a. use of the binomial system ✔
b. agreed/developed by scientists / OWTTE ✔
c. hierarchy of taxa used ✔ Names of the seven taxa not required.
d. three domains used/three domain names ✔ OWTTE
e. genome/DNA sequence similarities
OR
amino acid sequence of specific proteins ✔
f. species from a common ancestor are grouped together
OR
included in the same clade/branch in cladogram ✔
g. use evidence of evolutionary origin ✔ Allow example e.g. fossil record comparison
h. shared characteristics within a group
OR
similar embryonic development ✔
