Chapter 10 Self-test questions

Organogenesis

Quiz Content

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. The segmental identity of imaginal discs is determined by:

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. In thinking about the development of the wing imaginal disc of Drosophila, what is the significance of "compartments"?

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. Hedgehog signaling at the compartment boundary in the Drosophila wing disc leads to the expression of which signaling molecule in the adjacent anterior cells?

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. Keeping in mind the fact that genes are often named for the phenotype of a mutation in that gene, what might be the phenotype of a mutation of the Distal-less gene in Drosophila?

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. Which of the following correctly describes the sequence of events by which the position of limbs along the antero-posterior axis of chick and mouse embryos is specified?

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. Cartilage (bone-forming tissue) and connective tissue of the vertebrate limb originate from

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. Removal of the apical ectodermal ridge of a limb bud leads to

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. Grafting of a second polarizing region into the anterior region of a limb bud results in

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. Which of the following proteins is unlikely to be involved in pre-axial polydactyly in mice?

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. The Drosophila apterous gene is related to the mouse Lmx1b gene, and both are involved in

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. The muscle-forming cells of the vertebrate limb come from

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. If apoptosis in the developing limb were blocked, what feature of a normal limb would not form?

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. The programmed cell death that separates the digits depends on which signaling pathway?

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. The type of tooth that will form in different regions of the jaw is controlled by

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. Heart development begins as

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. The engineered expression of the mouse Pax6 gene in the Drosophila antennal disc

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