1. Cell Reproduction

2. Cell Reproduction – Gamete Production 4.6
Meiosis is necessary for ________ reproduction because it allows organisms to make sex cells or _______.
sexual
gametes

3. Spermatogenesis
The process in which sperm cells are made is called _________________.
___ sperm cells, all the same size, result from each cell that starts meiosis.
Spermatogenesis 4

4. Oogenesis
The process in which egg cells are made is called ____________.
___ large egg
cell results from
each cell that
starts meiosis.
3 smaller cells
die 
oogenesis 1

5. Sexual Reproduction Reproduction Video Sexual reproduction occurs
when a sperm cell unites with
an egg cell in a process called
______________.
The fertilized egg cell is
called a _________.
It has the _________ (2n) number of chromosomes because ½ come from the _________ (n) and ½ come from the _____(n).
fertilization
zygote
diploid
mother
father
Reproduction Video

6. Chromosomal Conditions
_______________ is when the
chromosomes do not separate
properly during meiosis.
This causes the gametes
to have an _________ number
of chromosomes.
Nondisjunction Animation
Nondisjunction
abnormal

7. Chromosomal conditions con’t
When 3 copies of the
same chromosome are
found in a cell, it is called
_________.
When only 1 copy of a
chromosome is found
in a cell, it is called
___________.
Offspring that receive an
abnormal number of
chromosomes usually:
trisomy
Abnormal Karyotypes
monosomy
Die or do not develop properly