Meiosis

Topic 10.1

Essential idea: Meiosis leads to independent assortment of chromosomes and unique composition of alleles in daughter cells.

Understandings

10.1.U1 Chromosomes replicate in interphaseface before meiosis

Replication of chromosomes during S phase

10.1.U2 Crossing over is the exchange of DNA material between non-sister homologous chromatids

Crossing over between non-sister homologous chromatids

10.1.U3 Crossing over produces new combinations of alleles on the chromosomes of the haploid cells

Crossing over creates new combinations of alleles

10.1.U4 Chiasmata formation between non-sister chromatids can result in an exchange of alleles

Chiasmata formation

10.1.U5 Homologous chromosomes separate in meiosis I

Meiosis I diagram

10.1.U6 Sister chromatids separate in meiosis II

Meiosis II diagram

10.1.U7 Independent assortment of genes is due to the random orientation of pairs of homologous chromosomes and meiosis I

Independent assortment explained diagram

Skills

10.1.S1 Drawing diagrams to show chiasmata formed by crossing over

Drawing a chiasmata formed by crossing over
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