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Meiosis Guided Notes. Ramshaw – Biology . Interphase…. Interphase happens at the start of _____________ as well as mitosis. Prior to prophase I, the cell goes through the G1, S, and G2 phases of ________________. Prophase I (chapter 10).

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Meiosis guided notes l.jpg

Meiosis Guided Notes

Ramshaw – Biology


Interphase l.jpg
Interphase…

  • Interphase happens at the start of _____________ as well as mitosis.

  • Prior to prophase I, the cell goes through the G1, S, and G2 phases of ________________.


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Prophase I(chapter 10)

  • DNA coils into ___________ chromosomes, spindle fibers appear, nucleus disappears.

  • Every chromosome is paired up next to its ______________ (the chromosome that is the same size and shape).

  • This is called _____________ and does not occur in mitosis.


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Prophase I (cont.)

  • Each pair of homologous chromosomes is called a ______________.

  • When chromosomes line up next to each other, “____________ ______” occurs and they exchange pieces of DNA.

  • This is called _________ recombination.

Crossing over

Only one cross over is shown

but many occur per pair.



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Review of Key Terms

  • Homologue (Homologous Chromosomes):

  • Synapsis

  • Tetrad

  • Crossing Over


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Metaphase I

  • _____________ line up in the center of the cell next to each other.

  • Spindle fibers from one centriole attach to the centromere of one _________ chromosome then spindle fibers from the opposite centriole attach to the other homologous _____________.


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Anaphase I

  • Each homologous chromosome moves to the _____________ pole.

  • This __________ separation of homologous chromosomes is called ________________ assortment.

    • It separates the chromosomes you inherited from your mom and dad and creates new combinations of ________ on each chromosome!


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Telophase I

  • Chromosomes reach the opposite ends of the ______, new nuclei form in each new cell, and spindle fibers __________.

  • The new cells are ___________!


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To review…

What are the major events in Meiosis I?…

  • Prophase I:

  • Metaphase I:

  • Anaphase I:

  • Telophase I:


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NO INTERPHASE HERE

  • There is no interphase between _____________ 1 and ____________ 2. This is very important because there is no S phase!!! (no doubling of the ________!!!)


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Start of Meiosis II

Prophase II

  • Centrioles form and move toward the __________

  • The nuclear membrane ________________


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Metaphase II

  • __________ fibers attach from the centrioles to the centromeres

  • The __________ chromatids line up along the cell equator


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Anaphase II

  • The centromeres __________ and sister chromatids separate 

  • The cell starts to ______ apart


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Telophase II – Cytokinesis

  • The cell pulls _____________ apart – forming new nuclei, one in each cell

  • Cytokinesis reaches completion, creating ___ haploid ____________ cells


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These 4 haploid cells then create:

  • ______________!

  • If the organism going through meiosis is a female, only ___ of the cells becomes the egg, the others become “_______ Bodies” and are dissolved by the body. This process of making an egg is called __________________.

  • If the organism going through meiosis is a male, _____ __ cells become spermatids which mature in to sperm. This is called _______________________.


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Major events in Meiosis!

  • The cell starts out by doubling the _____ in Interphase:

After S1 phase

(Sister chromatids)

Copy of Chromosome

(doubling the DNA)

A chromosome before

the S1 phase

Original

Chromosome


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After Interphase is…

  • Prophase I

  • _____________ and crossing over occur

  • Lets draw that out!


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Then comes:

  • Metaphase I – Homologous chromosomes line up in the _________ of the cell next to each other.

  • Anaphase I – The __________ are pulled apart, one to each side of the cell

  • Telophase I – Two ___________ cells are formed


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Then the second part - Meiosis II

  • Prophase II – Nucleus _______________

  • Metaphase II – Chromosomes line up _________ file down the middle of the cell

  • Anaphase II – Sister chromatids are pulled ___________ towards opposite ends of the cell

  • Telophase II – 4 __________ cells are formed


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