Zoology
radial symmetry
body plan in which any number of imaginary planes drawn through the center of the
body could divide it into equal halves
sessile
Describes an organism that remains attached to a surface for its entire life and does not
move
bilateral symmetry
Body plan in which only a single, imaginary line can divide the body into two equal
halves.
morula
A solid ball of cells that makes up an embryo; in humans, this stage occurs within four
days of fertilization.
blastula
A hollow ball of cells that marks the end of the cleavage stage during early embryonic
development in animals.
blastocoel
the fluid-filled cavity inside a blastula
gastrula
In animal development, a series of cell and tissue movements in which the blastula-
stage embryo folds inward, producing a three-layered embryo, the gastrula.
blastopore
The opening of the archenteron in the gastrula that develops into the mouth in
protostomes and the anus in deuterostomes
archenteron
The central cavity in the gastrula stage of embryological development; it is lined by
endoderm and ultimately gives rise to the adult digestive tract.
mesoderm
which germ layer gives rise to muscle (smooth and striated), bone, cartilage, connective
tissue, adipose tissue, circulatory system, lymphatic system, dermis, genitourinary
system, serous membranes, and notochord.
endoderm
Which germ layer gives rise to the stomach, the colon, the liver, the pancreas, the
urinary bladder, the epithelial parts of trachea, the lungs, the pharynx, the thyroid, the
parathyroid, and the intestines.
ectoderm
The surface ___________ develops into: epidermis, hair, nails, lens of the eye,
sebaceous glands, cornea, tooth enamel, the epithelium of the mouth and nose.
The neural crest of the _________ develops into: peripheral nervous system, adrenal
medulla, melanocytes, facial cartilage, dentin of teeth.
The neural tube of the ___________ develops into: brain, spinal cord, posterior
pituitary, motor neurons, retina.
,protostome
an animal whose mouth is formed from the blastopore
deuterostome
animal whose anus is formed from the blastopore of a blastula
spiral cleavage
A type of embryonic development in protostomes, in which the planes of cell division
that transform the zygote into a ball of cells occur obliquely to the polar axis, resulting in
cells of each tier sitting in the grooves between cells of adjacent tiers.
radial cleavage
A type of embryonic development in deuterostomes in that the planes of cell division
that transform the zygote into a ball of cells are either parallel or perpendicular to the
polar axis, thereby aligning tiers of cells one above the other.
placozoa
What phylum is this microscopic simple creature
Porifera
what phylum associated with sponges, lack true tissues, organs, mouth, and gut. Has
choanocyte cells
Cnidaria
what phylum consisting of Anemones, Corals, and Jellyfish. It has three types of cells:
nematocyst for stinging, spirocyst for adhesion, and ptychocyst for tube construction
Hydrozoa
what class in phylum cnidaria consists of hydra, hydroids, portuguese man of war, and
fire coral which alternates between polyp and medusa stages
,
radial symmetry
body plan in which any number of imaginary planes drawn through the center of the
body could divide it into equal halves
sessile
Describes an organism that remains attached to a surface for its entire life and does not
move
bilateral symmetry
Body plan in which only a single, imaginary line can divide the body into two equal
halves.
morula
A solid ball of cells that makes up an embryo; in humans, this stage occurs within four
days of fertilization.
blastula
A hollow ball of cells that marks the end of the cleavage stage during early embryonic
development in animals.
blastocoel
the fluid-filled cavity inside a blastula
gastrula
In animal development, a series of cell and tissue movements in which the blastula-
stage embryo folds inward, producing a three-layered embryo, the gastrula.
blastopore
The opening of the archenteron in the gastrula that develops into the mouth in
protostomes and the anus in deuterostomes
archenteron
The central cavity in the gastrula stage of embryological development; it is lined by
endoderm and ultimately gives rise to the adult digestive tract.
mesoderm
which germ layer gives rise to muscle (smooth and striated), bone, cartilage, connective
tissue, adipose tissue, circulatory system, lymphatic system, dermis, genitourinary
system, serous membranes, and notochord.
endoderm
Which germ layer gives rise to the stomach, the colon, the liver, the pancreas, the
urinary bladder, the epithelial parts of trachea, the lungs, the pharynx, the thyroid, the
parathyroid, and the intestines.
ectoderm
The surface ___________ develops into: epidermis, hair, nails, lens of the eye,
sebaceous glands, cornea, tooth enamel, the epithelium of the mouth and nose.
The neural crest of the _________ develops into: peripheral nervous system, adrenal
medulla, melanocytes, facial cartilage, dentin of teeth.
The neural tube of the ___________ develops into: brain, spinal cord, posterior
pituitary, motor neurons, retina.
,protostome
an animal whose mouth is formed from the blastopore
deuterostome
animal whose anus is formed from the blastopore of a blastula
spiral cleavage
A type of embryonic development in protostomes, in which the planes of cell division
that transform the zygote into a ball of cells occur obliquely to the polar axis, resulting in
cells of each tier sitting in the grooves between cells of adjacent tiers.
radial cleavage
A type of embryonic development in deuterostomes in that the planes of cell division
that transform the zygote into a ball of cells are either parallel or perpendicular to the
polar axis, thereby aligning tiers of cells one above the other.
placozoa
What phylum is this microscopic simple creature
Porifera
what phylum associated with sponges, lack true tissues, organs, mouth, and gut. Has
choanocyte cells
Cnidaria
what phylum consisting of Anemones, Corals, and Jellyfish. It has three types of cells:
nematocyst for stinging, spirocyst for adhesion, and ptychocyst for tube construction
Hydrozoa
what class in phylum cnidaria consists of hydra, hydroids, portuguese man of war, and
fire coral which alternates between polyp and medusa stages
,
