Transcript Aim: How do cells make new cells?

Asexual vs Sexual
Reproduction
I can…
 Describe types of asexual and sexual
reproduction
 Compare asexual and sexual reproduction
Reproduction
 The process by which organisms produce
more of their own kind
 Allows living things to pass on their traits
to offspring
- Think about it –
Without reproduction, all life on
earth would no longer exist.
Types of Reproduction
 SEXUAL
 Two parents
 Offspring
genetically
different than
parent
 ASEXUAL
 One parent
 Offspring
identical to
parent (clones)
 Vegetative
reproduction
ASEXUAL Reproduction
CON
 If environment
changes, will
not be adapted
PRO
 Easy, fast
 Only one
“parent”
needed
Types of Asexual Reproduction
 Binary fission
 Budding
 Spores
 Vegetative growth
Binary Fission
 occurs in one-celled
organisms
 DNA gets copied
 cytoplasm divides in half
 2 new identical daughter
cells of equal size
 Ex. Ameoba,
Paramecium
Budding




DNA gets copied
Little bud forms
Cytoplasm divides
One daughter cell is larger than the
other
 Ex. Hydra, yeast
Animation (.flv)
Vegetative Growth
 Occurs only in plants
 New plants grow from
the roots, stems, or
leaves of the parent
plant.
 Ex. Spider plant,
strawberry runners
Spores
 Zoospores
released in large
numbers
 Surrounded by a
thick coat to help
them survive harsh
environmental
conditions
 Ex. Molds, moss
The Cloning
Controversy
Pg. 29
9A – due Tuesday
9B – due Tuesday
9C – due Friday
SEXUAL Reproduction
 TWO parents involved
 Offspring are genetically different to their
parents
 Sperm and egg (gametes) come together
 Fertilized egg is
called a zygote
Sexual Reproduction
PRO
 Genetic
diversity in
offspring
CON
 More “difficult”:
 Time
 2 individuals
Types of Sexual Reproduction
 Zygospores
 Bacterial Conjugation
 Flowering Plants (angiosperms)
 Animals
Angiosperms (Flowering Plants)
 Pollen (sperm cell)
 Ovule (egg cell)
 Pollen tube
Zygospores
 Some plants reproduce sexually using
zygospores
 Ex. Mosses, molds
Bacterial Conjugation
 Bacteria transfer
genetic material
 DNA travels through
tube connection
 ***No new cell is
produced – only new
genetic information in
cell
Bacterial Conjugation (animations)
Animals (animation)
 Gametes come
together to form
zygote
 DNA is combined
***What is a gamete?
Gametes
 Gamete is a haploid cell (meaning
a cell with only half the genetic
information)
 Sperm cell is a gamete
 What other cell is an example of a
gamete?
8 celled zygote
Learning Check:
 Identify the type of
reproduction in
each
A._______________
B._______________
C._______________
D._______________
Types of Reproduction
 SEXUAL
 Two parents
 Offspring
genetically
different than
parent
 ASEXUAL
 One parent
 Offspring
identical to
parent (clones)
 Vegetative
reproduction
ASEXUAL Reproduction
CON
 If environment
changes, will
not be adapted
PRO
 Easy, fast
 Only one
“parent”
needed
SEXUAL Reproduction
 TWO parents involved
 Offspring are genetically different to their
parents
 Sperm and egg (gametes) come together
 Fertilized egg is
called a zygote
Sexual Reproduction
PRO
 Genetic
diversity in
offspring
CON
 More “difficult”:
 Time
 2 individuals
Types of Asexual Reproduction
 Binary fission
 Budding
 Spores
 Vegetative growth
Types of Sexual Reproduction
 Zoospores/Zygospores
 Bacterial Conjugation
 Flowering Plants
 Animals