MEIOSIS II
Hop up and down
Three Blind Mice
Overall
MEIOSIS II
Target: I will be able to identify and describe the key
stages of Meiosis II.
Meiosis II: Separation of the sister chromatids (the arms
of a chromosome).
Produces 4 daughter cells- each with 23 chromosomes.
Daughter cells (one from the mother and one from the
father) recombine at fertilization to produce an embryo
with 46 chromosomes- the correct number for human
life.
Pg. 109
Phases of Meiosis II
1. Prophase II: Each new cell forms a spindle.
Chromosomes move toward the center of the spindle.
2. Metaphase II: chromosomes attach to the spindle and
line up on the equator.
3. Anaphase II: Chromosomes divide when Sister
Chromatids pull apart.
Now the chromosomes are single stranded.
4. Telophase II: the two daughter cells divide.
Four haploid cells with single stranded chromosomes
are produced.
These gametes are genetically different from the
parent cell that they came from.
Mitosis
Type of Cell
Somatic (Body)
Meiosis
Gamete (Sex)
# of Cells Produced
after division
2
4
Haploid or Diploid
cells produced
Diploid
Haploid
Genetically identical
or different cells
produced
# of chromosomes in
human cells
Identical
Different
46
23
4. Telophase II: the two daughter cells divide.
Four haploid cells with single stranded chromosomes
are produced.
These gametes are genetically different from the
parent cell that they came from.
Summary:
BREAKING DOWN MEIOSIS
Draw the product
(result) of Meiosis I.
Predict what would happen if
the second division (Meiosis II)
didn’t happen. (Why is it
important that there are two
divisions?).
Diagram Synapsis
and Crossing Over
Draw the product
(result) of Meiosis II.
Pg. 108