First instar larva 1 day Second instar larva 1 day Third instar larva 3 days

First instar larva 1 day second instar larva 1 day

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First instar larva --- 1 day Second instar larva --- 1 day Third instar larva --- 3 days Pupa --- 5 days Adult --- 50~80 days Hatching Molting Molting Metamorphic Molting Eclosion
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Overview Mitotic cycle 1-10: 8 min/cycle Cycle 10: nuclear migration (Cycle 9: pole cell migration) Neuroblast delamination on the ventral side Germ band: trunk (thorax + abdomen) ectoderm and mesoderm Germ band extension and retraction: convergent extension Mesoderm invagination along the ventral midline Midgut invagination at two locations: anterior and posterior ends Gastrulation Cleavage stage --- superficial cleavage Mitotic cycle 11-13: 10 to 25 min/cycle Mid-blastula transition--- zygotic transcription starts Mitotic cycle 14: 75 to 175 min/cycle Cellularization: syncytial blastoderm cellular blastoderm Organogenesis and Dorsal closure
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Figure 9.2 Laser confocal micrographs of stained chromatin showing syncytial nuclear divisions and superficial cleavage in a series of Drosophila embryos : pole cells (germ line cells)
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Figure 9.3 Nuclear and cell division in Drosophila embryos Mitosis in syncytial blastoderm DNA Actin Microtubules
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Figure 9.4 Formation of the cellular blastoderm in Drosophila coordinated work of cytoskeleton Actin cytoskeleton vs. microtubules Actin microfilaments: Blue Microtubules: Green Nuclear envelope: Red (B): Nocadozole-treated embryo
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Figure 9.5 Gastrulation in Drosophila Gastrulation followed by Twist protein
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