Question 18N.2.HL.TZ0.3
| Date | November 2018 | Marks available | [Maximum mark: 4] | Reference code | 18N.2.HL.TZ0.3 |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Outline, State | Question number | 3 | Adapted from | N/A |
State one similarity and one difference between the structure of genes and short tandem repeats.
[2]
similarity:
both made of DNA/nucleotides
OR
both have bases/adenine/cytosine/guanine/thymine
OR
neither has uracil ✔
difference:
genes are longer/have longer DNA/base sequences «without repeats»
OR
genes have introns/exons but tandem repeats do not
OR
genes have base sequences that code for polypeptides/proteins and tandem repeats do not ✔
Outline the role of short tandem repeats in DNA profiling.
[2]
a. tandem repeats allow individuals to be distinguished/compared/identified
OR
tandem repeats are used to identify the source of a DNA sample ✔
b. unique/different number of repeats/combination of tandem repeats in each individual
OR
unique/different pattern of bands in each individual ✔
c. PCR used for copying/amplifying «tandem repeats» ✔
d. gel electrophoresis used for separation «of tandem repeats»/create pattern of bands ✔
