Accoraing to the developmental priniple of Hans priesch he pospective potency of

Question

Accoraing to the developmental priniple of Hans priesch he pospective potency of early blastomeres in cleavage their prospective fate a. greater than b. less than . the sane as 20. Ir early aleavage blastomeres from Prg A are injected into the anucleated activated egg of Prog B, the resulting offspring from Frog B would a. look like Frog B c. look like a chimeras of Frog A &Frog; B d. be spontaneously aborted. b. look lixe Frog A 21. The notochord appears during b. gastrula c. neurulation a. blastulation d. somite formation 22. The neural tube results from morphogenetie movement of the b. cutaneous endoder a. notochordal mesoderm a. neuroectoderm 23. A drug the targets only cells of the epimere. Treatment with this drug during early development should result in damage or arrest of a. the nervous system b. the heart c. GI tract e. lower limbs d. dorsal mesoderm ng and 24. The process of compaction occurs duri results from a. early cleavage; gap junctures only b. blastula; gap junctures and tight junctures c. blastula; tight junctures only d. early cleavage; gap junctures and tight junctures e blastula & cleavage; tight junctures only 5. The polarity and location of the primary hypoblast determine the location and direction of the future a. neural tube c. neural plate b. primitive streak d. notochord 26. In vertebrates, the derived from a. ectoderm d. combination of these b. endoderm c. mesoderm 27. In vertebrates, the formation of the ectoderm and endoderm germ layers occurs at a. cleavage b. blastula formationc. neurulation d. gastrulation e. a & b 28. In amphibians, the blastopore a. forms the dorsal and ventral lips b. appears in early blastula c. becomes the primitive gut d. a & b e. a,b & c

Explanation / Answer

19. a)greater than

20. c)look like a chimeras of frog A and frog B

21. b)gastrula

22. a)notochordal mesoderm

23. d)dorsal mesoderm as epimere is the dorsal part of a mesodermal segment of a chordate embryo.

24. a)early cleavage,gap junctures only

25. b)primitive streak

26. a)ectoderm

27. b)blastula formation

28. e)a,b and c

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