BIO SCI 94 Lecture Notes - Lecture 14: Lophophore, Lophotrochozoa, Ecdysozoa

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Robin Bush

Document Summary

Asexual reproduction generates offspring that are genetically identical to a single parent. In sexual reproduction, two parents contribute genetic information to produce unique offspring. Sexual and asexual reproduction have advantages and disadvantages which is why some organisms do both! Animals, by definition, are capable of movement under their own power at some point in their life cycle. These animals with sessile adult forms have mobile larval life stages. These are juveniles, meaning they have not not yet reached their adult form, sexual maturity or size. There is no haploid form of animals, and thus no alternation of generations. ~herbivorous feeders: they eat plants & algae (vegans!) ~ mass feeders: they eat chunks of food and need substantial mouth parts to acquire those. ~ deposit feeders: for example, worms sucking in dirt and digesting whatever is in it. The protostomes initiate gastrulation from a pore that becomes their mouth.