Biology 2581B Study Guide - Quiz Guide: Anatomical Terms Of Location, Neuroectoderm, Blastoderm
1 Jun 2020
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Through development, organisms must achieve distinct body axes. Different organisms have different ways of creating this axial patterning. In frogs, the site of sperm entry and organiser graft sets up dv axis. In drosophila, the bicoid gradient sets up ap axis while the dv axis is set up using morphogens. The early drosophila embryo exists as a cellular blastoderm with a relatively identical field of cells. Despite this, cells in the dorsal ectoderm will become epidermis, cells in the neurectoderm will become nervous system and cells in the mesoderm will become muscle. All of these cells need to be specialised and arrive in the correct places according to axes. Scientists were interested in how the dv axis was achieved so they mutagenised fruit flies and looked for ones with mutated dv axes. They found a dorsalised class of genes and a ventralised class.
