Notes: Sexual and Asexual...
Transcript of Notes: Sexual and Asexual...
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Notes: Sexual and
Asexual Reproduction
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Sexual Reproduction – process in which 2 parents contribute genes (via
sperm and egg) to form a new individual
The resulting individual will be a combination of the male and female parents. This combination of genes creates an entirely unique individual unlike any other.
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Sexual Reproduction –Requires two sex cells – egg and sperm
The egg and sperm join to form an entirely new organism (called a zygote)
Different from the parent organismOffspring has half of the Mother’s DNA and half of
the Father’s DNA
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Benefits of Sexual Reproduction
• Genetic differences help a species survive adverse conditions like disease and environmental changes. If individuals have variation, some of them may have a gene that helps them survive when others do not.
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Downsides of Sexual Reproduction
• Sexual Reproduction requires two individuals: It takes valuable time and energy to find or compete for a mate
• Sexual reproduction takes a while – depending on the size of the organism it can take a long period of time for the offspring to grow enough to be born. Ex: for humans it takes 266 days to reach full term and elephants take 624 days. (This is called a gestation period)
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Downsides of Sexual Reproduction
• Offspring of sexually reproducing organisms usually require time for care from the parents after birth as well. There is time needed between litters.
• Organisms that reproduce sexually usually have offspring that develop inside the mother. This limits the amount of offspring one can have at a time.
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Asexual Reproduction – reproduction involving only one parent organism.
The offspring created through asexual reproduction have the exact same genetic material as the parent; the offspring is a CLONE of its parent.
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Benefits of Asexual Reproduction
• There is no energy or time required to find a mate.
• The production of offspring is usually external so the parent can have LOTS of offspring in a very short amount of time.
• There is no parental care required; since the offspring are copies of the parent there is no “baby” stage
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Downsides of Asexual Reproduction
• Offspring of asexually reproducing organisms are identical to their parents. All members of the species are identical to one another. If a disease or change in environment occurs, all individuals will be affected.
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Types of Asexual Reproduction:
Binary fission - one single cell copies itself and splits in two, creating a new
individual.
**This is how BACTERIA
reproduce**
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Binary Fission in Bacteria
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Types of Asexual Reproduction:
Budding- an offspring grows out of the
body of the parent and then breaks off.
**The offspring organism is smaller than the parent.The buds grow into fully matured individuals which eventually break away from the parent organism.**
Hydra is an Animal that Reproduces through
Budding
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Types of Asexual Reproduction:
Vegetative Reproduction- process by which
new plant "individuals" arise or are obtained without production of seeds or spores
***Examples are the runners of strawberries, the tubers of potatoes, and the bulbs of onions***.
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Types of Asexual Reproduction:
Regeneration- if a piece of a parent is detached, it can grow and develop into a
completely new individual.
**This is how STARFISH
reproduce**