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Meiosis: 10 th Grade

Meiosis: 10 th Grade. Resources. Are all on the Blog!. Homework for Monday. Create a document which outlines the process of meiosis AND explains one disease that is caused by an error during meiosis Your document must be accurate, must demonstrate knowledge, and must be creative

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Meiosis: 10 th Grade

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  1. Meiosis: 10th Grade

  2. Resources Are all on the Blog!

  3. Homework for Monday Create a document which outlines the process of meiosis AND explains one disease that is caused by an error during meiosis • Your document must be accurate, must demonstrate knowledge, and must be creative • Label AT LEAST: gene; chromosome; DNA, crossing over and all the steps of meiosis • Provide a summary of ONE disease that results from an error during meiosis (a non-disjunction disorder)

  4. What is the biological purpose of sex?

  5. Meiosis is a two step process • Meiosis 1 separates the homologous pairs of chromosomes: this is the reduction division • Meiosis 2 separates the sister chromatids (resembles mitosis) • One single diploid cell produces 4 non-identical haploid cells

  6. Essential definitions: homologous chromosomes • Human somatic cells have 22 homologous chromosome pairs (autosomes) and one non-homologous pair (sex chromosomes) • One maternal/ one paternal • Same size and structure • Same genes at same loci • Alleles may differ

  7. Essential definitions: (sister) chromatids • Chromatid: one of two identical halves (sister chromatids) of a replicated chromosome • NB: following crossing over, sister chromatids are no longer identical!

  8. Essential definitions: Bivalent (tetrad) • One pairof homologous (duplicated) chromosomes which associate during prophase 1 of meiosis • The process of pairing is called synapsis

  9. Getting to grips with meiosis • Meiosis – the movie • Short summary • Fabulous website based tutorial • Step through from Sumanas

  10. Diploid germ cell chromosomes duplicate during S phase BEFORE meiosis

  11. Homework for Monday Create a document which outlines the process of meiosis AND explains one disease that is caused by an error during meiosis • Your document must be accurate, must demonstrate knowledge, and must be creative • Label AT LEAST: gene; chromosome; DNA, crossing over and all the steps of meiosis • Provide a summary of ONE disease that results from an error during meiosis (a non-disjunction disorder)

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