Aim: How do our cells
develop, grow and repair?
 Do
Now: Recall the worst
cut you have ever had.
Record the following info in your
notes->
• Think of how the cut happened
• Remember the healing process
• Locate the scar (if any) and
make observations

Homework:
Castle learning
Reproduction
A characteristic of all living
things that result in the
continuation of life from one
generation to the next.
Characteristics of
Living Things?

Organisms have a varied lifespan from a
few hours to many years.

Each organism undergoes a lifecycle
from the time of its formation  death

One or two parents
I. All Organisms are Made up of
Cells.

UNI and Multi Celled organisms MUST
reproduce to grow, develop and heal.
II. All living things have DNA that
coil into Chromosomes
III. Living things want to
ensure their species survival.

Organisms MUST reproduce to pass on
hereditary information.
How are all these things
accomplished?
 The
known method is Reproduction
and it is grouped into two main
types: Sexual and Asexual.
Explain…Is reproduction necessary for
an organism to maintain homeostasis?
Reproduction is needed to pass on
hereditary information for the
continuation of an organism
BUT….
it is NOT needed to maintain
homeostasis!
Sexual Reproduction

2 parent cell (gametes) join together to
form offspring

Offspring are UNIQUE
Asexual reproduction
A cell that has undergone growth and is
ready to divide is called a MOTHER CELL
 The division of a
mother cell
gives us 2 equal
daughter cells


Offspring are
identical
What is Mitosis?

Is the duplication and
distribution of
nuclear material.
(chromosomes/DNA)
Each daughter cell
receives the same
number of
chromosomes as the
mother cell.

What is the Purpose of Mitosis?
http://www.sciencedaily.com/releases/2014/01/140110102645.htm
Each Species is Different in the
Number of Chromosomes

Humans have


Dogs have


46 chromosomes
38 chromosomes
Fruit Flies have

8 chromosomes
But the way in which the chromosomes
get distributes when they divide is the
same in all organism
Mitosis
in Humans
46
46
46
But the way in which the chromosomes
get distributes when they divide is the
same in all organism
Mitosis
in Dogs
38
38
38
But the way in which the chromosomes
get distributes when they divide is the
same in all organism
Mitosis
in Fruit Flies
8
8
8
Which statement concerning
production of offspring is correct?
1. Production of offspring is necessary for a species to
survive, but it is not necessary for an individual to survive.
2. An organism can reproduce without performing any of the
other life processes.
3. Production of offspring is necessary for an individual
organism to survive, while the other life processes are
important for a species to survive.
4. Reproduction is a process that requires gametes in all
species.
Summary
Which row in the chart
below best describes
asexual reproduction?
Row
Number of
Parents
Comparison of
Offspring to
Parents
one
identical
one
different
two
identical
two
different
1.
2.
3.
4.
Asexual reproduction of organisms
normally results in new organisms
that contain cells with
1.
2.
3.
4.
more chromosomes than are found in the
cells of the parent
half the number of chromosomes
the same number of chromosomes
fewer chromosomes that are found in the
cells of the parent
Which phrase best describes the
process represented in the
diagram?
1.
2.
3.
4.
germination of a pollen grain in a flower
identical gametes being formed by
mitotic cell division
development of seeds in a ovule
daughter cells being formed by mitotic
cell division