1/3/11

1/3/11- Today, we began a new unit: reproduction. The main concept that we learned was the main differences between external and internal fertilization and external and internal development. We also completed the first 3 pages of notes, which can be found on Mrs. Andrew's moodle page.
So, the main differences between external and internal fertilization is the fact that external fertilization involves the union of gametes outside the body and usually involves water-type environments. Internal fertilization, however, involves the union of gametes inside the body and is most common in terrestrial animals.
In addition, the main differences between internal and external development is the fact that external development involves growth of offspring outside the body, and internal development involves growth of offspring inside the parent's body.
Besides the types of fertilization and development, we also discussed the two types of reproducing organisms: sexual and asexual. Sexually reproducing animals reproduce via the fertilization of sperm (from a male parent) and egg (from a female parent). An asexually reproducing organism is one who literally "clones" itself, because of the fact that they would reproduce without the fertilization process.



Justin A. is the next scribe poster.