problemset3

problemset3 - Problem Set 3. Due by 1 AM on Saturday...

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Unformatted text preview: Problem Set 3. Due by 1 AM on Saturday 2/6/10. 1. (.5) The polarity of the dorsal-ventral axis in a Xenopus embryo is first specified a) before fertilization. b) by the process of fertilization. c) during cleavage. d) during gastrulation. e) after gastrulation. 2. (.5) The polarity of the animal-vegetal axis in a Xenopus embryo is first specified a) before fertilization. b) by the process of fertilization. c) during cleavage. d) during gastrulation. e) after gastrulation. Development of dorsal structures in Xenopus. For each given experiment (3-6), select the best single outcome (1-3) from the choices below. 1. The embryo does not develop any dorsal structures 2. The embryo develops normally 3. The embryo develops extra dorsal structures 3. (.5) Brief UV irradiation just after fertilization, followed by a physical rotation. 4. (.5) Brief UV irradiation just after fertilization, followed by transplantation of a ventral vegetal blastomere from a normal 32-cell embryo onto the dorsal vegetal side of the irradiated embryo at...
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problemset3 - Problem Set 3. Due by 1 AM on Saturday...

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