Standard 3.2.1
MEIOSIS 1
During interphase 1 cells undergro a round of DNA replication , forming duplicate chromosomes
During prophase 1 each chromosomes pairs with its corresponding homologous chromosomes to form a tetrad
During metaphase 1 spindle fibers attach to the chromosomes
During anaphase 1 the fibers pull the homologous chromosomes toward opposite ends of the cell
During telophase 1 and cytokinesis nuclear membranes form the cell separates into two cells
During prophase 1 each chromosomes pairs with its corresponding homologous chromosomes to form a tetrad
During metaphase 1 spindle fibers attach to the chromosomes
During anaphase 1 the fibers pull the homologous chromosomes toward opposite ends of the cell
During telophase 1 and cytokinesis nuclear membranes form the cell separates into two cells
MEOSIS 2
prophase 2 meiosis i result in two haploid (N) daughter cells , each with half the number of chromosomes as the original cell
metaphase 2 the chromosomes line up in a similar way to the metaphase stage of mitosis
anaphase 2 the sister chromatids separate and move toward opposite ends of the cell
telophase 2 and cytokinesis meiosis 2 results in four haploid (N) daughter cells
1.Genetic variation is increased by meiosis. During fertilisation, 1 gamete from each parent combines to form a zygote. Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique 2.Crossing over is the exchange of genes between homologous chromosomes, resulting in a mixture of parental characteristics in offspring.
3. Non disjunction is the failure of one or more pairs of homologous chromosomes or sister chromatids to separate normally during nuclear division, usually resulting in an abnormal distribution of chromosomes in the daughter nuclei.
3. Non disjunction is the failure of one or more pairs of homologous chromosomes or sister chromatids to separate normally during nuclear division, usually resulting in an abnormal distribution of chromosomes in the daughter nuclei.