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TLS Online TPP Program

#Question id: 4649

Which statement best describes the evolution of pesticide resistance in a population of insects?

#Zoology

  1. Individual members of the population slowly adapt to the presence of the chemical by striving to meet the new challenge.

  2. All insects exposed to the insecticide begin to use a formerly silent gene to make a new enzyme that breaks down the insecticide molecules.

  3. Insects observe the behavior of other insects that survive pesticide application, and adjust their own behaviors to copy those of the survivors.

  4. Offspring of insects that are genetically resistant to the pesticide become more abundant as the susceptible insects die off.

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TLS Online TPP Program

#Question id: 39258

#Plant Biotechnology

Q. Assertion (A): Asymmetric hybrids often contain multiple genome copies of the non-irradiated parent.
Reason (R): Irradiation of one parent leads to extensive chromosome breakage and deletion.
TLS Online TPP Program

#Question id: 39259

#Plant Biotechnology

Q. Assertion (A): After repeated backcrossing of asymmetric hybrids with N. plumbaginifolia, plants with a diploid N. plumbaginifolia genome and a few A. belladonna chromosomes were recovered.
Reason (R): Backcrossing helps eliminate unwanted alien chromosomes while retaining selected genes.
TLS Online TPP Program

#Question id: 39260

#Plant Biotechnology

Q. Assertion (A): All asymmetric hybrids contained nitrate reductase gene and rDNA repeats of Atropa belladonna.
Reason (R): rDNA repeats are often preferentially retained during asymmetric hybridization.
TLS Online TPP Program

#Question id: 39261

#Plant Biotechnology

Q.Assertion (A): Hybrids obtained from irradiated carrot and non-irradiated rice protoplast fusion resembled rice plants.
Reason (R): The non-irradiated parent usually contributes more intact genomic material.
TLS Online TPP Program

#Question id: 39262

#Plant Biotechnology

Q. Assertion: The fusion of B. napus (AACC) and B. nigra (BB) results in a hybrid with the genomic constitution AABBCC. 
Reason: This specific interspecific fusion was primarily conducted to transfer resistance against Phoma lingam (black-leg disease) to rapeseed.
 
TLS Online TPP Program

#Question id: 39263

#Plant Biotechnology

Q. Assertion: Somatic hybridization between non-flowering and male sterile dihaploid clones of potato can result in male fertile hybrids. 
Reason: Symmetric hybridization allows for the creation of superior hybrids and the generation of novel genetic material by bypassing traditional sexual reproduction barriers.