Robinson deck part 2 Flashcards
Define asexual reproduction and list it’s types?
Is when parent reproduces with genes from only one parent
Examples
We can see fission- split of body of parent into two different offspring. Genetically identical- see this in flatworms.
Budding is a type of asexual reproduction- is an example where adult grows on parent. Example is hydra. The parent organism grows a new organism on it which has all the same features of the parent and eventually break off.
Fragmentation- is where piece of adult organism can separate and become new organism, different than fission cause animal is not splitting into two, just a piece is coming off of it.
Parthogenesis- Is a unfertilized egg, see this in bees. Also see in vertebrates- a tailed lizard.
What are advantages of asexual reproduction?
is really useful for organisms that are reproducing in isolation- don’t need to waste energy on finding mate
Allows for rapid reproduction.
What are disadvantages of asexual reproduction?
The con is that you can’t diversify genes so disease will easily KO you
Can organisms maintain genetic diversity while being asexual? Give an example.
Whiptail lizards maintain genetic diversity by maintaining a diploid status by doubling their genetic information, allows them to asexually reproduce but still maintain genetic diversity.
What’s sexual reproduction?
offspring Have genes from two parents
Define gametogenesis
formation of male and female gametes.
Name the large gamete
Eggs are larger non motile gametes, tend to be the largest cell found in mammals.
Whats fertilization?
Fertilization is combination of egg and sperm.
Define Dioecious
means two houses, means two different sexes so two of the sexes are in separate individuals. Also called gonochoristic.
Define Monoecious
means one house- one organism houses both egg and sperm. Can have sequential hermaphrodite where animals have the ability to generate both egg and sperm at different stages. An example of this is clownfish.
What animals can self fertilize?
simultaneous hermaphrodite- they can self fertilize.
What are pros of sexual reproduction?
There’s more genetic diversity, it can be advantageous in unstable environments allows them to survive, compared to asexual wher eif one is vulnerable all are vulnerable.
What are cons of sexual reproduction?
Takes a lot of energy and resources to make these gametes and finding a mate is very costly. Can be metabolically costly, and is a lot more complex and slower than asexual reproduction.
What mechanism are in place to ensure the right sperm meets the right egg?
A lot of mechanism to ensure the right sperm meets the right egg. For example there are attractants that bring the right egg and sperm together. Only one sperm fertilizes the egg.
How does sperm fertilize and deposit info in egg
Sperm are specialized to move forward they are motile, eggs are non motile. Sperm find an egg, they have enzymes on their acrosome- a secretory vesicle, these enzyme break into the egg in order to deliver genetic information into the egg.