Midterm 2 (Part 3) Flashcards
blastopore
correspond to opening of aarchenteron
coelom
body cavity with tissues from mesoderm and ectoderm, some triploblastic dont have
blastopore develops into
mouth (protostomes) anus (deuterostomes)
what is metamorphisis
developmental transformation that truns animal into juvenile that resembles adult but not sexually mature
what is similar to animals
unicellular choanoflagellates, have similar genome sequences
what do body cavities do
support, transport and diffusion, gorwth of organs
reproduction in animals
dominated by diploid phase, unicellular haploid phase
what forms neural tube/NS
infolding of neural tube from ectoderm
what is a neoblast
in fragmentation, undiff. stem cells that can regenerate whole organism
when a diploid zygote undergoes mitosis…,
it becomes a blastula
bilateral symmetry tissues
ectoderm, mesoderm, endoderm (triploblastic)
what are hox genes
control expression of 100+ genes to determine morphology, homeotic genes to control identity of tissue, orientation, segmentation, repitions
what tissues do sponges have
choanocytes similar to choanoflagellates (feeding by filtration)
amoebocytes to transport nutrients to other cells
what is gastrulation
formation of gastrula through infolding, formation of enbryonic tissues that will develop to adult body parts
features of animals
eukarotyes, multicell. hetertroph, breath oxygen (aerobic/oxidative respiration)
radial vs bilateral symmetry?
r- central axis, no anterior/posterior region
b- dorsal/ ventral, anterior region (sensory), posterior( tail, anus, locomotion)
archenteron
primitive gut
what is larva
sexually immature form of an animal that is morphiologically distinct from adult
4 kinds of cell cleavage RIDS
spiral cleavage-oblique to axis
radial-parallel to axis
determinate-each cell specific part of embryo
indeterminate- each cell potential produce complete embryp
notochord?
dorsal flexible rod in chordates for support
what is an animal
can move, reproduce, cells into tissues, development throuh blastula, abcence of cell wall (matrix)
radial symmetry tissues
ectoderm, ednoderm (diploblastic)
what are cadherins
proetins for cell attactment, have cytoplasmic cadherin domain,
needed for multicellularity
requires cell adherence and cell signaling
examples of animals to reproduce sexually
jellyfish (budding), sponges and flatworms (fragmentation), parthenogensis (offspring from unfertilized eggs)
