The Stages of Meiosis

OCR AS-level BiologyCell DivisionLesson 13 of 31

Genetic recombination happens at the start of meiosis, making each chromatid different.

Meiosis I is a reduction division that separates the pairs of homologous chromosomes into two different cells.

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mitosis: Nuclear division producing two daughter nuclei that are genetically identical to the parent nucleus, used in growth, repair and asexual reproduction.
meiosis: Nuclear division that halves the chromosome number, producing four genetically different haploid daughter cells for use as gametes.
chromatid: One of two identical copies of a chromosome, joined by a centromere, formed after DNA replication.
homologous chromosomes: A pair of chromosomes, one from each parent, that carry the same genes at the same loci but may carry different alleles.
haploid: Having a single complete set of chromosomes, as found in gametes.