CAIE A-Level Biology A2 16.1.4 Chromosome Behaviour During Meiosis Questions
Explain chromosome behaviour during meiosis using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- A2
Explain chromosome behaviour during meiosis using evidence from each question and mark scheme.
Fig. 8.1 shows a cell from the testis of a locust at the late prophase I stage of meiosis.
Fig. 8.1
Explain how the behaviour of the chromosomes in prophase I of meiosis results in the appearance shown in Fig. 8.1.
any four from:
1 DNA / chromatin / chromosomes / chromatids, condense ;
2 homologous chromosomes, pair up / undergo synapsis / form bivalents / form tetrads ;
3 crossing-over ;
4 between non-sister chromatids ;
5 detail of crossing over ;
6 chromosomes (stay) joined at, cross-over points / chiasmata ;