Cell Reproduction
Day 3
Warm Up
List the stages of mitosis in order
IPMAT
Meiosis

Meiosis = Cell division that produces only
haploid cells (half the number of
chromosomes)
Sex cells or gametes
 Spermatogenesis
 Oogenesis

Meiosis Occurs in Two Stages


Meiosis I

Meiosis II
Follows the same order as MITOSIS, but it
does it TWICE
Meiosis I

Homologous chromosomes
are separated into separate
cells.
Interphase I

Cell doubles its DNA and
then doubles it again
http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/meiosis1.html
Prophase I
Chromosomes form
 Crossing over takes place

http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/meiosis3.html
Crossing Over
Exchanging corresponding segments of
DNA
 Important because it gives a new
combination of genes.

Crossing Over
http://waynesword.palomar.edu/images/cross3.jpg
Metaphase I

Chromosomes line up
in the middle.
http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/meiosis4.html
Anaphase I

Chromosomes
separate
http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/meiosis5.html
Telophase I


Cell begins to divide
& 2 new cells form
(cytokinesis)
Each cell has
chromosomes
http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/Meiosis6.html
Meiosis II

Chromatids of each chromosome are
separated into separate cells
http://botit.botany.wisc.edu/images/130/Meiosis/Lilium_microsporogenesis/Meiosis_II.html
Prophase II

Chromosomes form in
both cells
http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/Meiosis7.html
Metaphase II

Chromosomes line up
along middle of cell
http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/Meiosis8.html
Anaphase II

Chromosomes
separate and are
pulled apart into
chromatids
http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/Meiosis9.html
http://www.scq.ubc.ca/filter/wp-content/uploads/2007/10/sister-chromatid.gif
Telophase II

Chromatids gather at
ends of cells

Cytokinesis occurs –
(cell splits apart)
http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/Meiosis10.html
End Result of Meiosis &
Cytokinesis

4 new cells each with
half as much genetic
info as the parent
http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/Meiosis10.html
http://www.cellsalive.com/meiosis.htm
Spermatogenesis
http://www.soc.ucsb.edu/sexinfo/images/12-06-spermatogenesis.gif
Oogenesis
http://img.sparknotes.com/content/testprep/bookimgs/sat2/biology/0003/oogenesis.gif