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U2L13

AP Biology B

QuestionAnswer
A maternal substance, such as a protein or RNA, that when placed into an egg influences the course of early development by regulating the expression of genes that affect the developmental fate of cells. Cytoplasmic determinants
The cellular and tissue-based processes by which an animal body takes shape. Morphogenesis
The discharge of hydrolytic enzymes from the acrosome, a vesicle in the tip of a sperm, when the sperm approaches or contacts an egg. Acrosomal reaction
The extracellular matrix surrounding a mammalian egg. Zona pellucida
A hollow ball of cells that marks the end of the cleavage stage during early embryonic development in animals. Blastula
Nutrients stored in an egg. Yolk
The point at the end of an egg in the hemisphere where the least yolk is concentrated; opposite of vegetal pole. Animal pole
An embryonic stage in animal development encompassing the formation of three layers: ectoderm, mesoderm, and endoderm. Gastrula (plural, gastrulae)
One of the three main layers in a gastrula that will form the various tissues and organs of an animal body. Germ layers
The innermost of the three primary germ layers in animal embryos; lines the archenteron and gives rise to the liver, pancreas, lungs, and the lining of the digestive tract in species that have these structures. Endoderm
The region above the blastopore on the dorsal side of the amphibian embryo. Dorsal lip
The process in which organ rudiments develop from the three germ layers after gastrulation. Organogenesis
One of a series of blocks of mesoderm that exist in pairs just lateral to the notochord in a vertebrate embryo. Somites
A territorial diagram of embryonic development that displays the future derivatives of individual cells and tissues. Fate maps
A thickened area of ectoderm at the tip of a limb bud that promotes outgrowth of the limb bud. Apical ectodermal ridge (AER)
The process in which one group of embryonic cells influences the development of another, usually by causing changes in gene expression. Induction
Created by: jtaylor422
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