Biology 1002B Lecture Notes - Lecture 16: Homeobox, Blastoderm, Gap Gene
19 Mar 2016
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Gene expression regulates changes that occur through differentiation. Regulatory genes act like master regulators, and in most cases the expression of them are controlled by induction. The arrangement of organs and body structures in their proper three- dimensional relationships) In drosophila, the division of nucleus via mitosis produces a multinucleate blastoderm as the cytokinesis does not occur in the early embryo. At the 10th nuclear division, the nuclei migrate to the edges of the embryo where after 3 divisions the 6000 nuclei are organized into separate cells. At this stage the embryo is a cellular blastoderm. The genetic control of determination and differentiation involved in mammalian skeletal muscle cell formation. 10 hours after fertilization, the cellular blastoderm develops into an embryo with distinct segments. 24 hours after fertilization the egg hatches into a larva that will undergo 3 moults until becoming a pupa. Adult fly emerges after metamorphosis 10-12 days after fertilization.
