Developmental Biology flashcards, diagrams and study guides
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events that occur in a woman's body from the time of fertilization (conception) until delivery (birth)
the first day of the last menstrual period until birth (~280 days), time during which development occurs
the moment the genetic material of the sperm and ovum combine
transports eggs from ovaries to uterus
the fertilized egg; it enters a 2-week period of rapid cell division and develops into an embryo
the act of becoming pregnant
The cranial area of the Neural Tube. F: Telenceohalon and Diencephalon. D: Ectoderm
Paired Vesicles that are the lateral part of the Prosencephalon. F: Optic cups. D: Ectoderm
Small opening at the cranial end of the Neural Tube.
10^11 (10 billion) making 10^14 synaptic connections.
Ectoderm, mesoderm and endoderm
flat group of cells present in prenatal development that becomes the brain and spinal cord. Remain
ANAT100: Development of Coelomic Cavity and its Divisions, Mesenteries, Dev of Diaphragm, Descent of Testis, Common Malformations
2nd week=bilaminar embryo floating in extraembryonic coelom -cavities (extraembryonic coelomic spaces) start to develop and appear within extraembryonic mesoderm and eventually fuse (coalesce) to form the extraembryonic coelom extraembryonic coelom= -fluid filled -surrounds amnion and umbilical vesicle except where attached to chorion at connecting stalk
gastrulation->trilaminar embryo, coelomic spaces appear within lateral embryonic mesoderm and cardiogenic mesoderm -- cranial above where the brain is developing (intraembryonic coelomic obliterates the wall as it splits the somatopleure and splanchnopleura and becomes one w/ the extraembryonic coelom) -fuses into a single horseshoe shaped cavity Divides lateral mesoderm to two layers: 1. somatic (parietal)layer -deep to ectoderm -continuous w/ extraembryonic mesoderm of amnion 2. splanchnic (visceral) layer -deep to endoderm -continuous w/ extraembryonic mesoderm of umbilical vesicle
coleomic spaces split the lateral plate mesoderm entirely in the region of the developing umbilical cord-- where the intraembryonic and extraembryonic coeloms are continuous
This embryo began as a fertilized egg; two individual gametes joined to produce one diploid cell. What processes have been responsible for the development seen here, once the egg is fertilized?
As organs and organ systems continue to develop in this embryo, the eyes will contain clear, transparent lenses. How does a single group of cells differentiate to produce both the transparent lens cells as well as all the other specialized cells in the completed organism?
When the sperm meets the egg during sexual reproduction, a zygote is formed. This single-cell zygote is the first step of a much more complex multi-cellular organism. Which statement describes the process the zygote undergoes immediately after fertilization?
2018 DAT Bootcamp- Chapter 12 Developmental biology (With images and funny mnemonics)
asexually only 1 organism is needed to reproduce and create offspring (asexual means no sex involve) all offsrping are gentically identical to parent.
DNA of a unicellular organism is replicated. 2 identical DNA molec migrate to opp side of cell. a *septum* appear in middle and form a dividing wall to separate the 2 DNA. septum splits into 2 to create 2 separate cell, each with 1 copy of DNA. Binary fission occur in prokaryote and some organelles within eukaryote
outgrowth (bud) form organism (either unicellular or multicellular). DNA of organism is replicate and deposit into the bud and the outgrowth bud off and separate from original organism to form a new organism. hydra (a cniaria) & yeast (fungus) buds.
The science of development of the individual before birth
repeated mitotic divisions, starting with the zygote. After 3 days, this results in the formation of a solid, spherical mass of cells known as morula.
solid, spherical mass of cells. Occurs after 3 days of cleavage of zygote.
Prokaryotes regulate their activities, producing only those genes necessary for the cell to function.
They control transcription. Some of these regulatory proteins help switch genes on, while others turn genes off.
It is a group of genes that are regulated together.
the fluid-filled cavity of a blastula
outer cells of the blastocyst that secrete enzymes that allow implantation
The folding in of a membrane or layer of tissue so that an outer surface becomes in inner surface.