Telophase 1

Edexcel AS-level BiologyMeiosis and Sexual ReproductionLesson 8 of 28

Telophase I is the final stage of the first meiotic division. It begins when the homologous chromosomes have reached opposite poles at the end of anaphase I.

In most animal cells:
• a nuclear envelope reforms around each group of chromosomes, giving two nuclei;
• the nucleolus reappears;
• the chromosomes may uncoil slightly;
• the spindle breaks down.
Cytokinesis then divides the cytoplasm, producing two cells.

Each of the two new nuclei is haploid: it contains one chromosome from each homologous pair. However, each chromosome still consists of two chromatids, and because of crossing over in prophase I these two chromatids are usually no longer identical.

More in Meiosis and Sexual Reproduction

• Meiosis
• Prophase 1
• Metaphase 1
• Anaphase 1
• Meiosis 2
• The Importance of Meiosis
• Chromosome Mutation
• Non-disjunction

All 28 lessons in Meiosis and Sexual Reproduction · All Edexcel AS-level Biology topics