10.1 Meiosis
IB Syllabus Statements
Understandings:
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Chromosomes replicate in interphase before meiosis.
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Crossing over is the exchange of DNA material between non-sister homologous chromatids.
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Crossing over produces new combinations of alleles on the chromosomes of the haploid cells.
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Chiasmata formation between non-sister chromatids can result in an exchange of alleles.
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Homologous chromosomes separate in meiosis I.
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Sister chromatids separate in meiosis II.
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Independent assortment of genes is due to the random orientation of pairs of homologous chromosomes in meiosis I.
Applications and skills:
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Skill: Drawing diagrams to show chiasmata formed by crossing over.
Video
Meiosis Part 1
Meiosis Extras
Meiosis Part 2
Mendel's 2nd Law and Meiosis
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Topic 10.1 Meiosis SSaQ (Syllabus Statement as Questions)
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When do chromosomes replicate in the cell cycle?
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Explain exactly what is happening when crossing-over occurs.
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What does crossing-over result in? Use the following terms: combination, allele, chromosome, haploid
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What are chiasmata and why are they important?
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When do homologous chromosomes separate in meiosis?
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When do sister chromatids separate in meiosis?
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Explain what is meant by ‘independent assortment of genes’ in meiosis I.
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Draw and label a diagram that shows chiasmata.