Choose right statement about cleavage pattern and gastrulation movements;

1.At the end of cleavage the animal embryo is essentially a closed sheet of cells, which is often in the form of a sphere enclosing a fluid-filled interior. Gastrulation, strictly the formation of the gut, converts this sheet into a solid three-dimensional embryonic animal body. 

2.During cleavage, cells move into the interior of the embryo, and the regions of endoderm. and mesoderm. which were originally adjacent in the cell sheet, take up their appropriate positions in the embryo.

3. Gastrulation results from a well- defined spatio-temporal pattern of change in cell shape, cell movement, and change in cell adhesiveness, the main forces of which are generated by localized contractions.

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#Question id: 23289

#Unit 8. Inheritance Biology

Preparation and staining techniques help to distinguish among chromosomes of similar size and shape, this staining techniques also distinguish the banding pattern of the chromosome at which stage of cell cycle?

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#Question id: 23560

#Unit 13. Methods in Biology

DNA molecules which are constructed with DNA from different sources are called

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#Question id: 23561

#Unit 13. Methods in Biology

General steps in the generation of a recombinant DNA molecule in the laboratory include

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#Question id: 23562

#Unit 13. Methods in Biology

________ is the propagation of individual host cells containing a recombinant DNA molecule.

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#Question id: 23563

#Unit 13. Methods in Biology

________ is the direct uptake of foreign DNA by a host cell.

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#Question id: 23564

#Unit 8. Inheritance Biology

Match the following

Column I	Column II
A) G-bands	i) viewing the chromosomes under ultraviolet light results from differences in the relative amounts of cytosine–guanine (C–G) and adenine–thymine base pairs
B) R-bands	ii) which are regions of DNA occupied by centromeric heterochromatin
C) Q-bands	iii) staining the telomere DNA  specifically
D) C-bands	iv) distinguish areas of DNA that are rich in adenine–thymine (A–T) base pairs
E) T-bands	v) reverting the dark bands by using saltingout method