MEIOSIS
 process by which ____________(egg and sperm) are
formed, occurs in the ________ and ________of humans
 for sexual reproduction to occur, sex cells (gametes) must
contain _______the number of chromosomes found in
somatic _________________.
 in order for a species’ chromosome number to remain
constant in each generation, the ________ (2n) number of
chromosomes must be reduced to the ________ (n)
number.
E.g. In humans:
haploid (n) = _________chromosomes
diploid (2n) = ________chromosomes
 at conception you receive an ________ amount of genetic
information from each parent, ___chromosomes from each
 meiosis involves ____ nuclear divisions, with only one
duplication of the chromosomes, occurring at the beginning
of meiosis I
 the chromosome number is divided in half (2n to n) during
__________, the reduction division. During this stage,
chromosomes are double-stranded, i.e. composed of 2
connected _______________
 during ____________, the paired chromatids separate to
become single-stranded chromosomes and the second cell
division occurs
STAGES OF MEIOSIS
Meiosis I (nuclear reduction)
 _________chromosome number (2n) is reduced to
_______ (n)
 ________________ pairs are separated
Prophase I
 _____________________ pair up to form __________ –
this is referred to as ______________
 ______________ takes place and genetic material is
exchanged
 homologous pairs attach to __________________
Metaphase I
 tetrads randomly line up at the __________ of the cell
Anaphase I
 homologous pairs ___________ to opposite poles of the
cell, splitting up the tetrads. This process is referred to as
_____________________
 CHROMOSOMES REMAIN DOUBLE STRANDED
Telophase I
 _________________________ begins to form
 cytoplasm is __________ and reorganized
Result of Meiosis I
 2 cells with haploid number of double-stranded
chromosomes
 2 resulting cells are _______ identical
Meiosis II
 separation of double-stranded chromosomes (sister
chromatids) into single-stranded chromosomes
 ______ replication of chromosomes prior to Meiosis II
Prophase II
 double-stranded chromosomes attach to _____________
Metaphase II
 double-stranded chromosomes ______ ____ along the
equator of the cell
Anaphase II
 sister chromatids __________ to opposite poles of the
cell, and are now referred to as ______________
 nuclear membrane begins to _____ around the
chromosomes
Telophase II
 cytoplasm is divided
Result of Meiosis II
 ____________________________________________