LS3+(Ext)+-+7


 * Students demonstrate an understanding of**
 * Natural Selection/ evolution by…**

7aa distinguishing the stages of mitosis and meiosis and how each contributes to the production of offspring with varying traits

7bb researching and reporting on the contributions of key scientist in understanding evolution and natural selection (e .g. Darwin, Wallace, Mendel).

7cc **trace** the evolution and migration of **Homo** //sapiens.//

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What do these GSEs mean? What subtopics do students need to address to understand these GSEs?

 * Understanding of important scientists (contributions, theories, hypothesis')
 * Meiosis I & II (Prophase, metaphase, anaphase, telophase)
 * Crossing Over
 * Sister chromatids
 * Homologous Chromosomes
 * Diploid vs Haploid

What ideas to students need to understand before they can address the topics described above?

 * Meiosis = 4 haploid cells (formation of gametes)
 * Mitosis = 2 diploid cells (formation of daughter cells)
 * Basic cell anatomy

What misconceptions are students likely to have about these topics?

 * Many confusions between the I & II parts of Meiosis
 * Diploid vs Haploid
 * Homologous Chromosomes vs Sister Chromatids
 * Centromeres splitting during Anaphase II NOT Anaphase I
 * Crossing Over during Prophase I NOT prophase II

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What activities or activity sequences can be used to address these GSEs?

 * 1) Students draw their own pictures of each stage of Meiosis based on the description
 * 2) Crossing Over Lab - clay models of homologous chromosomes (each a different color), have students interchange parts of each color clay so they can visually see the effects of crossing over.

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