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Unformatted text preview: • Positional info. – molecular cues that control pattern formation collectively • Embryonic lethal – mutations with phenotype causing death at the embryonic or larva stage • Egg polarity genes – maternal effect genes • Maternal effect gene – when a mutant in the mother results in a mutant phenotype in the offspring regardless of their own genotype • Morphogens – gradient of substances • Segmentation genes – the genes of the embryo whose products direct formation of segments after the embryo’s major body axes • Homeotic genes – the anatomical identity of segments is set by master regulatory genes • Cell lineage – basically a pedigree • Apoptosis – programmed cell death • Chimera – organisms with mix of genetically diff. cells • Organ identity gene – determines the type of structure that will grow from a meristem • Homeo box – 180 nucleotide box...
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- Spring '10
- Developmental Biology, maternal effect genes, Egg polarity genes, cells Pattern formation