Tag: Early Development in Animals

Given below are few statements regarding the role of Disheveled (Dsh) and β-catenin (β-cat) in the development of sea urchin. A. Dsh is localized in the vegetal cortex of the […]

Following statements with respect to development in sea urchin were put forth: A. The cell fates are determined both by autonomous and conditional modes of specification. B. Large micromeres are […]

33. In a given experiment, transplantation o micromeres from the vegetal pole of a 16-cell sea urchin embryo onto the animal pole of a host 16-cell sea Urchin embryo would […]

When the 4 blastomere pairs of the 8-cell stage tunicate embryo are dissociated, each forms most of the structures it would have formed had it remained in the embryo. However, […]

31. Which one of the following about development of sea urchin embryos is TRUE? (1) Each blastomere of a 4-cell stage possesses a portion of the original animal-vegetal axis and […]

Dreisch performed the “pressure plate experiment” to alter the distribution of nuclei in a 8-cell sea urchin embryo. He obtained normal larvae from these embryos. Following possible conclusions could be […]

29. Driesch performed famous ‘pressure plate” experiments involving intricate recombination with 8- celled Sea urchin embryo. This procedure reshuffled the nuclei that normally would have been in the region destined […]

28. With respect to the extra embryonic structures formed in the mammals, the possible functional attributes have been designated: A. Allantoin stores urinary waste and helps mediate gas exchange. It […]

Which one of the following mRNAs is a BMP inhibitor and can rescue the dorsal structures of ventralized Xenopus embryo when injected into it? (1) beta-catenin (2) Noggin (3) Disheveled […]