| Word |
Topic |
Definition |
|
acrosome
|
bisc333 |
a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg
www.cogsci.princeton.edu/cgi-bin/webwn |
|
animal pole
|
bisc333 |
The portion of an egg that is opposite the vegetal pole and that contains the nucleus and most of the cytoplasm.
http://education.yahoo.com/reference/dictionary/entry/animal%20pole |
|
blastema
|
bisc333 |
a mass of undifferentiated cells from which an organ or body part develops |
|
blastula
|
bisc333 |
early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs
www.cogsci.princeton.edu/cgi-bin/webwn |
|
cell-fate
|
bisc333 |
the structure or tissue type that a cell is destined to become |
|
cell-lineage
|
bisc333 |
A genealogic pedigree of cells related through mitotic division. |
|
chromatids
|
bisc333 |
after chromosomes replicate, two chromatids are joined to each other at the centromere |
|
cleavage
|
bisc333 |
repeated divisions of a cell or ovum |
|
dedifferentiate
|
bisc333 |
lose specialization in form or function |
|
differentiation
|
bisc333 |
Differentiation, in embryology, is the process in embryonic development during which unspecialized cells or tissues become specialized for particular functions. Differentiation, in oncology, is the degree of similarity or difference of tumor cells to the structure of the organ from which the tumor arose. In plant physiology, this refers to the change of a relatively unspecialized cell to a more specialized cell.
neurolab.jsc.nasa.gov/glosscd.htm |
|
ectopic
|
bisc333 |
Ectopic means out of place and is said of an organ which is not in its proper position, or of a pregnancy occurring elsewhere than in the cavity of the uterus. In cardiography, it denotes a heart beat that has its origin in some abnormal focus other than the sinoatrial node (the area of the heart where heart beats normally originate).
neurolab.jsc.nasa.gov/glosseh.htm |
|
egg chamber
|
bisc333 |
need exact defn' |
|
gametogenesis
|
bisc333 |
The formation of haploid gametes to allow the productions of a new diploid individual |
|
gastrula
|
bisc333 |
double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm
www.cogsci.princeton.edu/cgi-bin/webwn |
|
germarium
|
bisc333 |
the anterior, sausage-shaped portion of the insect ovariole. It is in the germarium that cystocyte divisions occur and the clusters of cystocytes become enveloped by follicle cells.
http://www.biochem.northwestern.edu/holmgren/Glossary/Definitions/Def-G/germarium.html |
|
germinal vesicle
|
bisc333 |
the two layers of cells, the
ectoblast and entoblast, which form respectively the outer
covering and inner wall of the gastrula. A third layer of
cells, the mesoblast, which is formed later and lies
between these two, is sometimes included |
|
homologues
|
bisc333 |
every diploid organism has two copies of each chromosome (except the sex chromosomes). Each of these pairs are homologues |
|
imaginal disc
|
bisc333 |
One of a series of disc-shaped structures in a fruit fly embryo which are located symmetrically along either side of the body. The imaginal discs are present within the larva and eventually develop into the body parts of the adult fruit fly during the pupal stage.
http://searchbox.hyperdictionary.com/dictionary/imaginal+disc |
|
morula
|
bisc333 |
a solid mass of blastomeres that forms when the zygote splits; develops into the blastula
www.cogsci.princeton.edu/cgi-bin/webwn
|
|
non-equivalent cell division
|
bisc333 |
a single cell divides to produce two daughter cells which now have different fates |
|
oogenesis
|
bisc333 |
The process of ovum formation in female animals. |
|
oogonia
|
bisc333 |
immature egg cells: have the potential to produce egg cells |
|
oogonium
|
bisc333 |
A female ancestral germ cell that divides several times to give rise to an oocyte that, in turn, develops into an ovum (an egg).
http://www.medterms.com/script/main/art.asp?articlekey=4642 |
|
ovariole
|
bisc333 |
One of the tubes of which the ovaries of most insects are
composed.
http://www.hyperdictionary.com/dictionary/ovariole |
|
parthenogenesis
|
bisc333 |
Some fish, reptiles and insects are all female and reproduce by parthenogenesis- the offspring are all clones of the female
|
|
polar bodies
|
bisc333 |
A small cell (which eventually disintegrates) that is the by-product of meiosis in female animals. One functional ovum and potentially three polar bodies result from meiosis of each primary oocyte.
http://www.biochem.northwestern.edu/holmgren/Glossary/Definitions/Def-P/polar_body.html |
|
spermatogenesis
|
bisc333 |
development of spermatozoa |
|
Sry gene
|
bisc333 |
The Y chromosome has a gene called Sry (sex-determining region on the Y)
|
|
syncytial blastoderm
|
bisc333 |
An insect embryo in which all the cleavage nuclei are contained within a common cytoplasm
http://www.biochem.northwestern.edu/holmgren/Glossary/Definitions/Def-S/syncytial_blastoderm.html |
|
syncytium
|
bisc333 |
a mass of cytoplasm containing several nuclei and enclosed in a membrane but no internal cell boundaries (as in muscle fibers)
http://searchbox.hyperdictionary.com/searchbox.aspx?define=Syncytium |
|
syngamy
|
bisc333 |
sexual reproduction by union of gametes |
|
totipotent
|
bisc333 |
having unlimited capability. Totipotent cells have the capacity to specialize into extraembryonic membranes and tissues, the embryo, and all postembryonic tissues and organs. |
|
vegetal pole
|
bisc333 |
the point on the surface of an egg that is diametrically opposite to the animal pole and usu. marks the center of the protoplasm containing more yolk, dividing more slowly and into larger blastomeres than that about the animal pole, and giving rise to the hypoblast of the embryo .
http://www.fasthealth.com/dictionary/v/vegetal_pole.php |
|
vitellarium
|
bisc333 |
A group of glands that secrete yolk around the egg in those invertebrates, such as worms, whose eggs do not contain yolk.
http://www.bartleby.com/61/77/V0127750.html |
|
zygote
|
bisc333 |
The diploid product of the union of haploid gametes in conception; a fertilized egg.
www.umanitoba.ca/faculties/science/biological_sciences/lab6/biolab6_gloss.html |