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Download Meiosis = nuclear division that reduces chromosome
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Transcript
Meiosis = nuclear division that reduces chromosome number by half sex cell division gametes = sperm & egg (ovum) (plural = ova) results in 4 haploid cells sperm (23) + egg (23) zygote (46) = fertilized egg you have exactly ½ of your Dad’s chromosomes and ½ of your Mom’s puberty = stage in life when sex cells begin to develop Two Stages of Meiosis: Meiosis I (preceded by DNA replication) = homologous chromosomes separate Meiosis II = sister chromatids separate Tetrad (tetra- = 4) = pair of homologous chromosomes sketch on whiteboard Synapsis = pairing of homologous chromosomes occurs in prophase I does not occur in mitosis Crossing Over = portions of chromatids break off & attach to adjacent chromatids on the homologous chromosome (results in genetic diversity)
