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Lecture 32

BIOL 1202 Lecture Notes - Lecture 32: Body Plan, Gastrulation, Blastocoel


Department
Biological Sciences
Course Code
BIOL 1202
Professor
Pomarico
Lecture
32

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NOTES FOR BIOLOGY 1202
DR. STEVEN POMARICO, INSTRUCTOR
4/21/17
CHAPTER 32
An Overview of Animal Diversity
The main distinguishing features of the Kingdom Animalia are
-Eukaryotic
-Multicellular
-Heterotrophic
-Ingestive method of digestion
-Sexual reproduction
-No cell wall
-Rapid response to stimuli
(nerves and muscles)
-In addition to these characteristics, as animals evolved from the animal-like protists, they
developed more complex and organized bodies.
-The closest relative to the animals are protists in the clade known as opisthokonts (see
fig 32.3)
-
-Cellular specialization or partnership between specialized cells may have been what
ultimately lead to the animal kingdom.
-Cellular specialization leads to the development of tissues, which then can lead to the
combination of tissues into an organ.
-Organs may then become arranged into organ systems.
-Tissues are specialized cells with a common structure and function that are grouped
together.
-Organs are centers of bodily function, which are usually made up of different tissues.
-Organ systems are groups of two or more organs that function together to perform a
common
task (e.g., digestion, gas exchange, reproduction)
4/24/17
-The presence or absence of tissues in an organism defines the first separation of a group
from the rest of the animals.
Embryonic characteristics are primarily driven by genes, too early for
environment to be playing a role in how organisms develop.
-Embryonic development is the precursor to more complex body plans
-In the early embryo (see fig 32.2) there are differences in how different linages in the
animal kingdom develop.
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