NAME____________________________
Period________
Cell Reproduction –Meiosis Outline
Need For Reproduction
 ________________ is the life process in which __________ things produce other
____________ things of the same ____________.
 _______________ is not _____________ for the life of one individual _________.
 It is _____________ for the continued _______________ of a particular group of
_____________________.
Cell Division
 All _________ arise from other ________ by cell ______________.
 When ___________ grow to a certain ___________ they must either __________ or
__________.
 If a cell continued to __________ without ____________, the surface __________ of the
___________ would become too _________ to hold the cell’s ___________.
Cell Division
 Cell _____________ is a complex series of __________ in the __________ of a cell that
leads to the _____________ of _________ new __________.
 The new __________ are called _________________ cells.
 The ______________ of the daughter cells are usually ______________ to each other
and to that of the _____________ cell.
 The _______________ cells _________ and increase in ______ until they ___________
and produce __________ more ___________ cells.
 This process __________________, resulting in organism __________ and
__________________.
Mitosis
 All cells in the __________ (except _______ cells) are produced by the process of
_____________ cell division.
 __________ involves a complex series of ___________ in the _________ of body cells
that produce ______________ (same) ______________ cells.
o They have the __________ number and __________ of ___________________ as
the _______________ cells.
The Cell Cycle – Stages of Mitosis
 Although the events of _____________ are an ongoing process, they are generally
described in terms of separate ___________, or ___________.
o __________________
o __________________
o __________________
o __________________
o __________________
Meiosis
 The process of ______________ involves ______ cell divisions and produces cells that
are ______________ from the ___________ cell.
o _____________ produces cells that have _____________ the number of
____________________ as the ____________ cells.
o If _____________ did not take place, the _______________ egg would have
________________ the amount of ________________ it needs.
 Meiosis takes place during ______________ reproduction when ______ cells, called the
_______ and ________, are produced in ______ organs.
The Cell Cycle- Stages of Meiosis
 During meiosis, two divisions of the nucleus occur. These divisions are called
_______________ and ________________.
o ________________
o ________________
o ________________
o ________________
o ________________
o ________________
o ________________
o ________________
o ________________
Meiosis
 One-half the number of ____________________ is called the ______________, (or n)
number.
o In humans, the ___________________ number (n) is _______.
 When the _________ and _________ unite during _______________, the species normal
chromosome number called the ______________ or (2n) number is restored (brought
back).
o The ______________ number in humans is __________.
o ____ (sperm) + _____ (egg) = ______
Summary of Meiosis
 _____________________ form during meiosis I.
 In meiosis II, both of these cells form ___________________________.
 The result is _________________ sex cells.
 Each sex cell has ___________________________ the number of chromosomes in its
nucleus that was in the ________________ nucleus.
 From a human cell with ______ _______________ chromosomes, meiosis produces
four sex cells each with ____ __________________ chromosomes.
Comparison of Mitosis and Meiosis
Characteristic
Number of daughter cells
Number of cell division
Daughter cells are
diploid or haploid
Daughter cells are identical or different
Parent cell is
diploid or haploid
Mitosis
Meiosis
Comparison of Mitosis and Meiosis
Characteristic
Mitosis
Meiosis
Number of daughter cells
2
4
Number of cell division
1
2
Daughter cells are
diploid or haploid
Diploid
Haploid
Daughter cells are
identical or different
Identical
Different
Parent cell is
diploid or haploid
Diploid
Diploid