Chapter 32 (Module 2) Flashcards
Characteristics of Animals (5)
- Heterotroph
- Eukaryotes
- Sexual Reproduction
- Diploid adults
- Body Plans
Why are they efficient consumers?
Heterotrophs, digestive systems, and can move, detect, and capture prey with movement.
Instead of cell walls animals cells have?
Structural protein collagen
Development stages:
- Sperm and Egg
- Zygote
- Cleavage: divides but doesn’t grow, 8-cell stage
- Blastula: hollow ball of cells
- Blastocoel: opening in middle of blastula
- Gastrulation: blastula folds inward and some now divide within the blastocoel
- Gastrula: 5 layers
Gastrula 5 layers:
Endoderm: inner layer
Blastocoel: Between Endo and Ecto
Ectoderm: Outer layer
Archteron: hole formed from gastrulation
Blastopore: Opening
Larva
Sexually immature form of an animal that has a different:
- appearance
- diet
- and environment
Hox genes:
family of regulating genes for placement of body parts and organs
Homeoboxes:
sets of DNA that are found within developmental genes
Hypothesized relative of multicellular animal:
Choana-flagellates are closely related to sponges.
What makes multicellularity possible?
Cells having a way to adhere and communicate to one another.
A body plan is…
…a set of morphological and developmental traits.
Types of symmetry: (3)
- None: no axis or line (ex. coral and sponges)
- Radial: meet environment equally on all sides (ex. jellyfish)
- Bilateral: move actively and have CNS, sense environment with their head (ex. cicada)
Ectoderm:
germ layer covering the embryos surface
Endoderm:
the innermost germ layer and lines the developing digestive tube called archenteron.
Diploblastic:
Two tissue types
