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Asexual vs Sexual Reproduction
Transcript of Asexual vs Sexual Reproduction
Only involves 1 organism (parent)
There are no specific sex cells
Found in lower organisms
No need to search for mate, no special cells required
Requires less energy
In a stable environment, creates large populations
No variation, same DNA - if the parent has a genetic disease, offspring does too
Has limited ability to adapt
Definition: Reproduction is the process by which an organism produces offspring of the same kind.
It is the simple growth and splitting of an organism into two or more.
ex: bacteria and paramecium
Produced by rapid cell division (mitosis)
cell division creates a "bud" off of the side of the organism
the "bud" then develops into an identical but smaller version of the parent
when large enough, it breaks off and moves away from the parent becoming independent
ex: hydra and jellyfish, and a lot of plants
some of these may reproduce sexually also at various stages of life and environmental conditions
Fragmentation (or regeneration):
Grows from a piece of the parent or original organism.
The ability to restore lost or damaged tissues, organs or limbs.
Only occurs in the simplest of animals,
usually these organisms reproduce sexually.
Ex. worms, starfish
New plants are produced from cutting/ separating sections off of "parent" plants.
These plants can frequently also reproduce sexually through egg and sperm "pollen and seeds".
There are many types of this. Here are a couple of them:
plants with a short stem and fleshy "bulb" which feeds the stem (typically in spring) allowing stem and roots to grow
ex. onion, iris, tulip
plants that create long shoot offs from parent plant which will then produce their own adventitious roots and shoots
ex. strawberries and spider plants
Let's look at 4 types of Asexual reproduction...
DNA from 2 individuals' sex cells (gametes) merge to form one offspring.
This is seen in plants and animals, and of course, humans
Creates a genetically diverse population which is not as disease prone
Better able to adapt to environment, etc
Requires much time and effort in attracting a mate
Produces smaller populations
There are two main processes:
1. the creation of gametes (meiosis)
2. the process of fertilization (and pollination in plants)
Genetically identical offspring
Genetically different offspring