class test qn._answer only question no.4_2 marks_developmental biology_answer wi

Question

class test qn._answer only question no.4_2 marks_developmental biology_answer with respect to chick development.

5. The order of cells involuting over Dorsal lip in Xenopus is (1) (A) Chordal mesoderm, Pharyngeal endoderm, Head mesoderm, (B) Pharyngeal endoderm, Head mesoderm, Chordal mesoderm (C) Head mesoderm, Chordal mesoderm, Pharyngeal endoderm (D) Pharyngeal endoderm, Chordal mesoderm Head mesoderm, (E) Head mesoderm, Pharyngeal endoderm, Chordal mesoderm Q2. When microtubule polymerization is blocked in a Xenopus egg (eg. By low temperature, high pressure or inihbitors) cortical rotation doesn't occur, does not form and a ventralized embryo eventually develops, Suggest two experimental intervention (done upto mid-gastrula) by which you could rescue such an embryo to develop normally. (5) Q3.Compare the nature and phenotype associated with the Antennapedia and Ultrabithorax mutation. (3) Q4. Differentiate between epiblast and hypoblast? (2) Scanned by CamScan

Explanation / Answer

Hi
Epiblast is the tissue type of embryo which is derived from inner cell mass. It gives rise to the three primary germ layers ectoderm, definitive endoderm and mesoderm. It also gives rise to extraembryonic mesoderm.

Hypoblast.
It is a tissue type of inner cell mass. It lies below the epiblast. It consists of small cuboidal cells. The extraembryonic endoderm including yolk sac are derived from hypoblast cells.

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