What is Reproduction?
Reproduction in living things…
Reproduction is…
•
when living things produce an offspring.
Types of Reproduction
Asexual
• Requires one parent
• Simplest form of reproduction
• Produces a clone of the parent
• Sexual
• Requires two organisms
• Male and Female
•
Reproduction
In living things…
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Asexual Reproduction
Asexual Reproduction
Reproduction in living things…
Reproduction in living things…
Let’s watch…
Budding
•
The young grows out of the body of the parent
Watch and observe
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4
Asexual Reproduction
Asexual Reproduction
Reproduction in living things…
Reproduction in living things…
Fragmentation
•
Regeneration
The body of the parent breaks into pieces
Watch and observe
•
A part of the parent is detached from the rest
of its body.
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Asexual Reproduction
Asexual Reproduction
Reproduction in living things…
Reproduction in living things…
Regeneration
Fragmentation VS Regeneration
Fragmentation
Regeneration
Occurs in fully
Occurs in multi-cellular differentiated multi-cellular
organisms with simple organisms with complex
body organization
body organization
An organism breaks An organism breaks into
pieces and each piece
into pieces and each
may
or may not develop
piece develops into a
into a new individual.
new individual.
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Asexual Reproduction
Asexual Reproduction
Reproduction in living things…
Reproduction in living things…
Formation of Internal Buds
•
Formation of Internal Buds
A parent releases a special mass of cells
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Sexual Reproduction
Sexual Reproduction
Reproduction in living things…
Reproduction in living things…
Let’s watch…
It all starts with fertilization
When the sperm cell fuses with the egg cell
• These are called gamete cells
•
Kinds of Fertilization
External Fertilization
• Eggs are fertilized outside the female body.
• Internal Fertilization
• Eggs are fertilized inside the female body.
•
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Sexual Reproduction
Sexual Reproduction
Reproduction in living things…
Reproduction in living things…
When does a human life begin?
When does a human life begin?
•
When the sperm cell reaches the egg cell
And then…
A series of cell division happens
The fertilized egg attaches to the womb of the
mother
• The uterus becomes bigger to accommodate
the baby for 9 months
• The developing embryo gets nutrients through
the umbilical cord
•
•
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Sexual Reproduction
Sexual Reproduction
Reproduction in living things…
Reproduction in living things…
When does a human life begin?
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When does a human life begin?
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