Pg 161-164 Notes: Meiosis.

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Presentation transcript:

Pg 161-164 Notes: Meiosis

Purpose To reduce chromosome # in half (46 23) Make gametes (eggs or sperm)

Meiosis Double mitosis (two cell divisions)

Meiosis Double mitosis (two cell divisions) (1) 2n  (2) 2n  (4) n

Meiosis Double mitosis (two cell divisions) (1) 2n (2) 2n  (4) n Results in four haploid cells (n) gametes

Meiosis I Similar to the phases of mitosis (1) 2n  (2) 2n Separates homologous chromosomes in four phases (PMAT I)

Two important events occur Crossing-over: random exchange of genetic material during Prophase I homologous pairs overlap and twist on each other and exchange genetic material (increases genetic diversity)

Two important events occur Independent Assortment: random separation of the homologous chromosomes occur during anaphase I Increases genetic diversity

Meiosis II 2 (2n)  4 (n) DNA is not replicated between meiosis I and meiosis II Divides sister chromatids in four phases (PMAT II)

Meiosis is the formation of gametes Gametes differ between the sexes Males produce 4 equal sperm cells Females produce one large egg and 3 smaller polar bodies that are eventually broken down

Homologous chromosomes are separated during (meiosis I) or (Meiosis II)?

Sister Chromatids are separated during (meiosis I) or (Meiosis II)?

Name the Event Depicted. When does this occur? https://www.youtube.com/watch?v=qpagEU36F_g

Mitosis Cell Division Meiosis Number of Cells Made Nuclear State of cell Made Chromosome # (for humans) Type of Cell Made (gamete or somatic) Genetically unique or identical? Picture

Assignments Classwork: Observing Mitosis Pre Lab BRING LAB MANUALS TOMORROW! HW: Phases of Meiosis and Mitosis Drawing from yesterday