Download - G7 Ch4.2 - Asexual Reproduction
Asexual Reproduction
Chapter 4 Lesson 2
p.128-137
Asexual Reproduction• A one-parent organism produces offspring
without meiosis and fertilization
• Offspring inherit the parent DNA
• Genetically identical
Budding
Animal Regeneration
Cloning
Vegetative Reproduction
Mitotic Division
Fission
AsexualReproduction
Fission• Prokaryotes divide rapidly through fission
– Pro = No (no nucleus)
• Steps1. The DNA molecule is copied
2. Each copy attaches to the cell membrane
3. Cell grows and splits
4. Finally, two new cells with one copy of the DNA*Original cell no longer exists
Mitotic Division• Unicellular Eukaryotes
– Eu = Yes (Yes, it has a nucleus)
• Unicellular organism divides by mitosis and cytokinesis.
Budding• A new organism grows by mitosis on the
body of the parent
• Genetically Identical
• When bud is large enough it can break from the parent
Animal Regeneration
Animal Regeneration• Offspring grow from a piece of the parent
• When the parent is cut or divided, the pieces has the potential to grow into a new organism
Regeneration• “Regeneration” also means the ability to
grow back parts of the body
• This is not asexual reproduction because it goes not produce a new organism
Vegetative Reproduction
• Offspring grows from a part of the parent plant
Cloning• Asexual reproduction done in a
laboratory to produce identical individuals from a cell or a cluster of cells taken from a multicellular organism
Cloning - Plants• Grown from meristems in culture
• “Meristem” – stem cells
Cloning - Animals• All the clone’s chromosomes come from
one parent
• The first mammal cloned was a sheep named Dolly
• Could save endangered species
• Ethical issues