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CSU BIOL 5515 Developmental Biology Chapter 6
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12
Biology
Undergraduate 4
02/28/2011

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Term
Cellular blastoderm
Definition
Product of superficial cleavage consisting of thousands of cells arranged in a single layer at the insect egg periphery.
Term
Energid
Definition
A nucleus and its associated cytoplasmic domain in a syncytial blastoderm.
Term
Gap genes
Definition
A set of genes whose products divide the embryo into broad regions and help to specify cell fates within those regions.
Term
Homeotic mutations
Definition
A mutation that causes one structure to be replaced by another one.
Term
Homeotic selector genes
Definition
In flies a set of genes whose products specify the characteristic structures of each segment.
Term
Imaginal disc
Definition
A small group of cells in an insect embryo or larva that are elaborated during metamorphosis to form adult structures such as eyes, legs, wings, antennae, and certain reproductive structures.
Term
Maternal effect genes
Definition
Genes of the maternal genome that are transcribed and accumulated during oocyte development and affect development of the embryo derived from the egg.
Term
Pair-rule genes
Definition
A set of genes whose products are expressed in stripes that subdivide broad gap gene regions into parasegments.
Term
Parasegment
Definition
Section of gene expression along the AP axis of a Drosophila embryo before segmentation that develops into the posterior portion of one body segment and the anterior portion of the next segment.
Term
Segment polarity genes
Definition
A set of genes whose products control orientation and cell fates within each segment.
Term
Segmentation genes
Definition
A set of genes whose products divide the Drosophila embryo into a repeating series of parasegments along the AP axis.
Term
Syncytial blastoderm
Definition
Intermediate product of superficial cleavage consisting of thousands of nuclei sharing a common cytoplasm and arranged in a single layer at the periphery of an insect egg.
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