BRAINCAKEAnaphase 1
The homologous chromosomes are pulled by the shortening of the nuclear spindles to either pole centromeres first.
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Key terms in this lesson
- chromatid
- One of two identical copies of a chromosome, joined by a centromere, formed after DNA replication.
- centromere
- The region of a chromosome that joins two sister chromatids together and attaches to the spindle fibres.
- homologous chromosomes
- A pair of chromosomes, one from each parent, that carry the same genes at the same loci but may carry different alleles.
- crossing over
- The exchange of sections of DNA between non-sister chromatids of homologous chromosomes during prophase I of meiosis, creating genetic variation.
- chiasmata
- The points at which non-sister chromatids of homologous chromosomes become entangled and exchange genetic material during crossing over.
More in Cell Division
- Homologous Chromosomes
- The Stages of Meiosis
- Prophase 1
- Metaphase 1
- Telophase 1
- Meiosis 2
- Specialised Cells and Tissues
- Epithelial Cells
All 31 lessons in Cell Division · All OCR AS-level Biology topics