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7-3 Sexual and Asexual Reproduction
Unit 7 – Reproduction and Heredity
Warm Up (on a blank half sheet)
1. What happens to a cell that will be part
of sexual reproduction?
2. How do cells divide during mitosis?
What is asexual reproduction?
A. Asexual
Reproduction – one
organism (the
parent) produces
one or more new
organisms
(offspring) that are
identical to itself.
How do organisms reproduce asexually?
1) Binary Fission – the
parent splits into
two new cells
exactly like the
parent.
http://www.youtube.com/watch?v=DY9DNWcqxI4
How do organisms reproduce asexually?
2) Budding – a tiny
bud forms on the
parent’s body and it
eventually grows
into a full sized
organism that is
identical to its
parent.
http://www.youtube.com/watch?v=489CSop00sY
How do organisms reproduce asexually?
3) Spores – specialized
cells that can
survive harsh
conditions.
Example: Fungi
How do organisms reproduce asexually?
4) Vegetative
reproduction – new
plants grow from the
stems, roots, or
leaves of the parent
plant.
a) Runners – above
ground stems from
which new plants
grow.
How do organisms reproduce asexually?
b) Tubers –
underground stems
from which a new
plant can grow.
Example - potatoes
How do organisms reproduce asexually?
b) Plantlets – tiny
plants that grow
along the edges of
a plant’s leaves.
They drop off the
plant and grow on
their own.
Odd Reproduction
1) Fragmentation – each segment of
the body becomes a new organism
if it breaks off of the body.
Example: tapeworms and planaria
Odd Reproduction
1) Regeneration – growing back a part
of an organism.
Example – Starfish regrows an arm
What is sexual reproduction?
B. Sexual
Reproduction –
two parents
each contribute
a sex cell to the
new organism.
What are the advantages of each type of
reproduction?
C. Advantages of Asexual Reproduction
1.
2.
Reproduces quickly
Offspring are identical to the parent.
This ensures that any favorable traits
the parent has are passed on to
offspring.
What are the advantages of each type of
reproduction?
3.
4.
A parent organism does not need a
partner to reproduce.
All offspring can reproduce.
What are the advantages of each type of
reproduction?
D. Advantages of Sexual Reproduction
1.
2.
Increases genetic variation
Offspring are not genetically identical
to the parents. So, they may have a
trait that the parents do not have,
making them more likely to survive.
Wrap Up – Four Corners
• Each corner of the room is labeled:
binary fission, budding, spore formation,
or vegetative reproduction.
• I will read a scenario.
• You will walk to the corner that names
the type of asexual reproduction that is
described.
Homework
• 7-3 Lesson Review, page 477