Cell Division and Asexual Reproduction

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First found May 22, 2018

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Bill Nye
Bill Nye

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Transcript

Cell Division and Asexual
Reproduction
Two Types of Reproduction
• Asexual
– Only one parent
– Offspring are identical to parent
• Sexual
– Two parents (egg cell and sperm cell)
Types of Asexual Reproduction
•
•
•
•
•
Binary Fission
Budding
Vegetative Reproduction
Fragmentation
Spore Formation
Characteristics of Asexual
Reproduction
• Only one organism is needed to reproduce
• All the offspring are genetically identical to
each other and to the parent organism
• A single organism can produce large numbers
of offspring
Binary Fission
• Parent undergoes cell division to produce
two genetically identical daughter cells or
offspring
• Example: Bacteria
Binary Fission
• Allows for rapid population growth under
ideal conditions
• Bacteria can double population every 20 mins
Budding
• Offspring begin as a small growth on the
parent
• Bud keeps growing (cell division) and
eventually breaks off from parent
• Example: Yeast
Vegetative Reproduction
• Plants that reproduce asexually
• Strawberries send out “runners” that can form
into new plants
Fragmentation
• Small part of an animal breaks off and grows
into a new organism
– Example: Sea Star
Fragmentation
• Parent can regrow lost body part
– Called “Regeneration”
Spore Formation
• Reproduction via forming large numbers of
spores
• Spores = similar to seeds
Cloning
Bill Nye: Cloning Video
Cloning Activity - Groups of 3
• You and your group are in charge of the
Science and Technology branch of the
Government of Canada
1. List out the pros and cons of cloning (human,
animals, etc.)
2. State your stance on cloning (fully agree on
all fronts? Support only animal cloning?)
3. Submit regulations (“we will allow cloning
under these circumstances”)
Review Questions
• To help study for the test
• Will not be collected, but if you do these
questions, it will definitely help
• Page 70 – 71
• Questions 1-14, 17, 18
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