Question 19N.2.SL.TZ0.b
| Date | November 2019 | Marks available | [Maximum mark: 4] | Reference code | 19N.2.SL.TZ0.b |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Outline | Question number | b | Adapted from | N/A |
Outline the structural and genetic characteristics of eukaryotic chromosomes.
[4]
a. linear/not circular DNA molecule
OR
one chromosome is one molecule of DNA/one chromosome is two DNA molecules «after replication» ✔
b. associated with histone proteins/nucleosomes ✔
c. centromere joins sister chromatids «after DNA replication» ✔
d. telomeres at the end «of the chromosome/chromatid» ✔
e. carries a sequence of genes / each gene occupies a specific locus ✔ Do not accept ‘sequence of bases’ for mpe.
f. alternative alleles of genes / homologous chromosomes carry same sequence of genes ✔
g. chromosomes in pairs / two «homologous chromosomes» of each type «in a diploid cell» ✔
h. non-coding sequences/example of a non-coding sequence ✔ Do not allow mph if the response states that chromosomes are always condensed.
i. supercoiled/condensed «during mitosis/meiosis» ✔
