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U1L07AnimalDiversity
AP Biology B
| Question | Answer |
|---|---|
| (1) The process of cytokinesis in animal cells, characterized by pinching of the plasma membrane. (2) The succession of rapid cell divisions without significant growth during early embryonic development that converts the zygote to a ball of cells. | cleavage |
| 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. | gastrulation |
| A free-living, sexually immature form in some animal life cycles that may differ from the adult animal in morphology, nutrition, and habitat. | larva |
| An early group of soft-bodied, multicellular eukaryotes known from fossils that range in age from 565 million to 550 million years old. | Ediacaran biota |
| In animals, a set of morphological and developmental traits that are integrated into a functional whole—the living animal. | body plan |
| Body symmetry in which a central longitudinal plane divides the body into two equal but opposite halves. | bilateral symmetry |
| Pertaining to the underside, or bottom, of an animal with radial or bilateral symmetry. | ventral |
| Pertaining to the rear, or tail end, of a bilaterally symmetrical animal. | posterior |
| The outermost of the three primary germ layers in animal embryos; gives rise to the outer covering and, in some phyla, the nervous system, inner ear, and lens of the eye. | ectoderm |
| The endoderm-lined cavity, formed during gastrulation, that develops into the digestive tract of an animal. | archenteron |
| The middle primary germ layer in a triploblastic animal embryo; develops into the notochord, the lining of the coelom, muscles, skeleton, gonads, kidneys, and most of the circulatory system in species that have these structures. | mesoderm |
| A fluid- or air-filled space between the digestive tract and the body wall. | body cavity |
| An animal that possesses a true coelom (a body cavity lined by tissue completely derived from mesoderm). | coelomate |
| A solid-bodied animal lacking a cavity between the gut and outer body wall. | acoelomate |
| In animals, a developmental mode distinguished by the development of the anus from the blastopore; often also characterized by radial cleavage and by the body cavity forming as outpockets of mesodermal tissue. | deuterostome development |
| A type of embryonic development in protostomes that rigidly casts the developmental fate of each embryonic cell very early. | determinate cleavage |
| A type of embryonic development in deuterostomes in which each cell produced by early cleavage divisions retains the capacity to develop into a complete embryo. | indeterminate cleavage |
| In a gastrula, the opening of the archenteron that typically develops into the anus in deuterostomes and the mouth in protostomes. | blastopore |
| Member of a clade of animals with bilateral symmetry and three germ layers. | bilaterian |
| Member of a group of animal phyla identified as a clade by molecular evidence. Lophotrochozoans include organisms that have lophophores or trochophore larvae. | lophotrochozoan |
Created by:
jtaylor422
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