Topic: Reproduction
Aim: Explain the processes of sexual
reproduction and meiosis.
Do Now: Phases of Mitosis Worksheet
HW: Read pages 627-629. Write a
paragraph comparing and contrasting the
male and female reproductive systems.
• As a result of mitotic cell
division, a cell having 40
chromosomes gives rise
to two cells each of which
has a chromosome
number of _______
chromosomes.
2 types of 1. SOMATIC CELLS =
body
cells
with
46
cells in
chromosomes
your body
2. GAMETES = sex cells with 23
chromosomes (1/2)
– Egg & sperm
•
2
parents
Sexual
Reproduction • Gametes from
each join to
produce new
organism
Why do gametes have half the
chromosome number?
23
23
46
Meiosis • Gametogenesis
• Cell division that
produces gametes
http://www.youtube.com/watch?v=
Ba9LXKH2ztU&feature=related
• 4 Daughter cells have half the
normal # of chromosomes
23
46
23
23
23
• 2 stages: Meiosis I, Meiosis
II
Let’s summarize…
1. Describe the two types of cells that
our bodies consist of.
2. Explain the difference between
asexual and sexual reproduction.
3. Explain the difference between
mitosis and meiosis.
What is the name of the process
that produces gametes?
(1)Mitosis
(2)Binary fission
(3)Asexual reproduction
(4)Meiosis
Cells such as nerve cells and
muscle cells are known as
(1)gametes
(2)sex cells
(3)somatic cells
(4)specialized cells
Which statement is true about sexual
reproduction?
(1)It produces offspring with half the
number of chromosomes as the parent.
(2)It involves sex cells joining together.
(3)It produces offspring that are
genetically identical to the parents.
The result of meiosis are daughter cells
that have
(1) half the number of chromosomes
(2) a quarter of the number of
chromosomes
(3) double the number of chromosomes
(4) the same number of chromosomes
The number of chromosomes
found in human gametes is
(1) 46
(2) 92
(3) 23
A
B
C
D
E
1. What process is represented in the diagram?
2. Describe the genetic makeup of daughter
cells.
3. What does phase A represent? What occurs
in this phase?
4. Explain what is occurring at phase E.