Card Set Information
All animals have the ability to reproduce ___
provide a glimpse of one way in which gene expression is translated into the many different forms that animals exhibit. More complex this is, more complex organism is
The animal kingdom is said to be ____. It contains __ animal phyla.
Animal Kingdom ancestor is most likely a colonial flagellated ____ similar to _____.
The Cambrian Explosion occurred roughly __ mya
4 (now 3) main morphological and developmental features used in classification of Animals:
Presence or absence of different tissue types
Type of Body Symmetry
Presence or absence of true body cavity (not since DNA advancement)
Patterns of embryonic development
The tissue category of all animal division
The Metazoa is divided into: ___, ___
on the side
no specialized tissues or organs. An example would be a ___
More than one type of tissue and organs
The symmetry of eumetazoa can be either ___ or ___.
Radiata (radially symmetrical)
Bilateria (bilaterally symmetrical)
Bilateral animals have ___ and dorsal and ventral ends. This is composed of __ layers.
Radial animals have __ and __ sides. This is composed of __ layers.
Cell layers develop during ___.
Endoderm (digestive system)
ectoderm (skin and nervous)
3rd layer in bilateral animals. Forms muscles and most other organs
organism whose body is completely lined with mesoderm
Coelom is not completely lined by tissue derived from mesoderm
lack a body cavity entirely
Fluid filled body cavity can protect internal organs or be used as _____
Embryonic development 2 types:
This has a spiral cleavage, cleavage determinate, and the blastopore becomes the mouth.
this has radial cleavage, cleavage is interdeterminate (pluripotent stem cells), and blastopore becomes anus
involved in pattern formation in early embryos
Changes in the hox gene expression controls body segment ____
Shifts in patterns of gene expression in the embryo along the ___ axis govern transition from one type of vertebra to another and short or long necks
New molecular techniques classify animals by comparing similarities in ___ and ___
The sequences of nucleotides in the gene that encodes RNA of the small ribosomal subunit (___). This changes very __ over time.
Metazoa is a monophyletic ___
At the earliest stages of evolution, molecular phylogeny supports the split between __ and ___, and also among the __ and __. Most animals belong to the ___.
Echinoderms and chordates belong to a clade called the ___
__ and colleagues used SSU rRNA to analyze the taxonomic relationships of arthropods and other taxa
Monophyletic clade ___ contains arthropods and nematodes
Bilateria are split up into __ and __.
Protosomes are divided into __ and __
Lophotrochozoans are named from stems __ (feeding tentacle) and and __ larva
Molecular data suggests that the presence or absence of a coelom or pseudocoelom may not be a ______
useful way to classify animals