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It seems that developmental genetics boils down to a complex network of gene regulation. Try to draw how this network is structured for Drosophila. How many genes do you think are necessary to describe a complete developmental network for the fruit fly? How many genes do you think are needed for a network to specify one segment? Do you think it is more difficult to identify genes that are involved in the beginning, middle, or end of this network? Knowing what you know about Drosophila development, suppose you were trying to identify all of the genes needed for development in a chicken. Would you first try to identify genes necessary for early development, or would you begin by identifying genes involved in cell differentiation?
The radius of the orbit of a moon of a given planet is equal to twice the radius of that planet. Denoting by ρ the mean density of the planet, show that the time required by the moon to complete one full revolution about the planet is (24π/Gρ)1/2, where G is the constant of gravitation.