Chapter 7 Flashcards
Is the process of repeated rapid mitotic cell divisions of the zygote (unicellular structure) to form the blastula (multicellular structure)
cleavage
the produced cells during cleavage are named
blastomeres
a ball of 32 cells
morula
the cavity of the blastula is the
blastocoel
which has more yolk between vegetal and animal pole
vegetal pole has more yolk than animal pole
complete division of the egg, occurs in species whose eggs have little or moderate amounts of yolk, such as sea urchins and frogs
holoblastic cleavage
incomplete division of the egg, occurs in species with yolk-rich eggs, such as reptiles and birds
meroblastic cleavage
the process by which cells occupy their
appropriate locations
morphogenesis
the movement of cells from the blastula surface to the interior of the embryo
gastrulation
the formation of organs
organogenesis
Epidermis of skin and its derivatives (including sweat glands,
hair follicles)
* Nervous and sensory systems
* Pituitary gland, adrenal medulla
* Jaws and teeth
* Germ cells
are derived from which layer
ectoderm
Skeletal and muscular systems
* Circulatory and lymphatic systems
* Excretory and reproductive systems (except germ cells)
* Dermis of skin
* Adrenal cortex
are derived from which layer
mesoderm
Epithelial lining of digestive tract and associated organs
(liver, pancreas)
* Epithelial lining of respiratory, excretory, and reproductive tracts
and ducts
* Thymus, thyroid, and parathyroid glands
are derived from which layer
endoderm
the blastopore will become the
anus
the part above the crease along the region where the gray crescent formed is called the
dorsal lip of blastopore
