Meiosis
Identify the stage
What stage?
Review
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homologs = matching chromosomes
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gene =
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alleles =
Key Vocabulary
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somatic cell –

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gamete 
example

gonad -
Key Vocab (cont)

diploid (2n) –
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haploid (n) –
Which is diploid, a somatic cell or a
gamete?
Purpose of Meiosis
 to produce gametes! (That’s easy!)
OR
 to reduce # chromosomes per cell by ½
WHY?? (See board)
What is a tetrad?
What funky thing do tetrads do?
Stages of Meiosis:
Interphase
Prophase I

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Is this cell human?
How many
chromosomes are
pictured?
How many pairs of
chromosomes
How many tetrads?
What is 2n for this
organism?
Metaphase I

Note tetrads (pairs)
line up on equator
instead of duplicated
chromosomes
Anaphase I
Telophase I

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How many cells?
How many
chromosomes per
cell?
How many pairs of
chromosomes in
each cell?
Prophase & Metaphase II
Anaphase & Telophase II
Cytokinesis and normal telophase events occur. Four haploid
daughter cells exist which can mature into gametes.
Cytokinesis and normal telophase events occur. Four haploid daughter cells
exist which can mature into gametes.
Compare & Contrast Mitosis &
Meiosis (BE SPECIFIC)

Contrast:
Compare & Contrast Mitosis &
Meiosis (BE SPECIFIC)
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Compare
Compare & Contrast meiosis in
men with meiosis with women: