21. 22. ( 23. 24. C 25. 26. 27. 28. 9. C If a frog zygote has ß-catenin mutation, the embryo will (a) develop normally. (b) become ventralized. (d) become none of the above. Each cell division in mammals during early embryogenesis takes approximately (c) become dorsalized. (a) 8 minutes. (b) I hour. (c) 5 hours. Early mammalian embryo cell division shows marked asynchrony. So odd numbered cells occur at early stage. (d) more than 10 hrs, (a) True, (b) False. The number of cells at the stage of morula in mammalian embryogenesis is (a) 2. (b) 4. (c) 8. (d) 16. The ICM (inner cell mass) is the external cells of morula. (a) True. (b) False. During human embryogenesis, blastocyst gives rise to trophoblast. (a) True. (b) False. The immediate recipient of the Hippo signal in the mouse blastocyst is (a) Yap. (b) Lats. (c) Tead4. (d) Cdx2. The signaling in question 27 occurs in the inner cells only. (a) True. (b) False. One enzyme that has been identified to help blastocyst coming out of the zona layer is (a) Gurken. (b) PKC. (c) trypsin. (d) EcoRI. The species that is NOT a member of the arthropod group is (a) crustacean. (b) hexapods. (c) myriapods. (d) nematode. Micropyle is the only sperm entry point for Drosophila eggs. (a) True. (b) False. In Drosophila oogenesis, a single progenitor cell oogonium undergoes the following rounds of cell division to generate a cells from which an oocyte is to be selected: (a) 2. (b) 3. (c) 4. (d) 5. The future dorsal of the developing Prosophila comunei

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