Male parental care is expected to observed during:

• Polygynous species

• Small population size

• Life long bond pairing

• Reverse sexual dimorphism

In Arabidopsis gene responsible for formation shoot meristem is

• Leafy

• Agamous

• Clavata

• Wus

One of the most important genes, involved in dorsal-ventral axis determination in Drosophila is dorsal. It codes Dorsal protein which

• Is taken up into the nuclei of cells and this side will become the ventral side

• remains in the cytoplasm of cell and this side will become ventral side.

• Is taken up into the nuclei of cells and this side will become the dorsal side

• Degraded in one side and that will become dorsal side

Which is true for amount of yolk and cleavage in egg of amphibian?

• Mesolcithal and holoblastic cleavage

• Isolecithal and holoblastic cleavage

• Mesolecithal and meroblastic cleavage

• Microlecithal and meroblastic cleavage

Which of the following is not a characteristic feature of Apoptosis?

• Swelling of cell   

• Nuclear fragmentation   

• Change in cell wall porosity   

• Permeability of mitochondrial inner membrane    

6.

Cytoplasmic determinants coding for anterior structure of Drosophila embryo if injected elsewhere in the recipient embryo, would lead to

• Normal development

• Formation of additional ectopic head

• Degeneration

• A phenotype with two heads and two tails

In amphibian oocyte, the germplasm which gets segregated during cleavage to give rise to primordial germ cells (PGC’s) is normally

• Distributed evenly throughout the oocyte

• Localized at animal pole

• Localized at vegetal pole

• Aggregated in central part of oocyte

You are studying the binding of proteins to the cytoplasmic face of cultured liver cells and have found a method that gives a good yield of inside‐out vesicles from the plasma membrane. Unfortunately, your preparations are contaminated with variable amounts of right‐side‐out vesicles. Nothing you have tried avoids this contamination. Somebody suggests that you pass the vesicles over an affinity column made of lectin coupled to Sepharose beads. What is the rational of this suggestion?

• Right-side-out vesicles will be lysed by lectin coupled to Sepharose beads

• Right-side-out vesicles will simply bind to the lectin coupled Sepharose beads.

• Lectin will bind to the carbohydrate residues present only on the inside out vesicles

• Lectin will bind to only glycoproteins and glycolipids present on the inside-out-vesicles

The overall length of the cell cycle can be measured from the doubling time of a population exponentially proliferating cells. The doubling time of a population of mouse L cells was determined by counting the number of cells in samples of culture at various times. What is the overall length of the cell cycle in mouse L cells?

• 30 h

• 20 h

• 10 h

• 40 h

When a wrist blastema from a recently cut Axolotl forelimb is placed on a host hindlimb cut at the mid thigh level, it will generate only a wrist. The host (whose own hindlimb was removed) will fill the gap and regenerate the limb upto the wrist. However, if the donor blastema is treated with retinoic acid on grafting, the wrist blastema will regenerate a complete limb and will not allow the host to fill the gap. This happens because the retinoic acid:

• Helps in the proximilization of the blastema and activates the Hox genes differentially across the blastema.

• Helps in distalization of the blastema and activates the Hox genes differentially across the blastema

• Helps block the receptors of FGF essential for limb development.

• Helps vigorous proliferation of the cells at the cut surface.