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Meiosis
Remember these key points…
How many sets of genes are in each
Organism?________________________________________
*A cell with 2 sets of genes is said to be ___________
-If the fertilized egg has 2 copies of the genes, how
many copies are in each sperm cell or egg cell?

___________ of the genes in the _________.

___________ of the genes in the ___________.
*These cells are called _____________ - cells with only
____ copy of the genes
How does an organism create haploid cells?

This happens through a process called ___________
Meiosis -
________________________________________
________________________________________________________________________
The Phases of Meiosis
 Meiosis I – before it begins the chromosomes are
____________________.
 Prophase I the _______________________________ breaks down and
_________________________ chromosomes (chromosomes that look
the same) pair up to form ______________.
 Portions of the tetrads get exchanged in a process called
________________
______________. This produces new combinations of alleles so the new
cells are genetically _____________________ from the original cell.
Metaphase I - ____________________ grow from the _________________ and connect to the
___________________
___________________ line up along the center of the cell
Anaphase I – the _______________________________ split apart. Each cell now has the
____________________ number of replicated chromosomes (__________)
Telophase I - the chromosomes ___________________. The nuclear membrane
_______________________
Cytokinesis I - ___________ new cells are formed. Each cell has only ________ of each gene and
is _____________________ from the mother cell.
Prophase II - _____________________________ dissolves. _____________ replicates
Metaphase II - _______________________________________ line up in the center of the cell.
______________________ attach to the ______________
Anaphase II - ______________________________________ are pulled apart
Telophase II and Cytokinesis II - __________________ new _______________ daughter cells
are formed
Why do it?
Creates cells that are ______________ (N) which allows _______________ to create a baby with the
correct number of genes
Creates cells that are _____________________________ which gives the baby a new set of traits
that might make it better able to _____________________________.
The four cells produced by Meiosis II are called __________________

In a male, the gametes produced are called ____________

In a female, only one of the four cells created becomes the _________. The other three cells are
called _______________________.
Comparing Mitosis and Meiosis
Meiosis
Mitosis