Practice Questions

TLS Online TPP Program

#Question id: 12937

Choose the incorrect statement about Yeast Artificial Chromosome vectors.

#Zoology

They are linear molecule composed of a centromere,telomeres and a replication origin termed ARS element.
It is digested with restriction enzymes at the SUP4 and Bam HI sites separating the telomere sequences.
It produces four arms and the foreign genomic DNA is fragmented.
They are replicated in yeast cells and the external cell wall of the yeast needs to be removed to leave a spheroplast.

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TLS Online TPP Program

#Question id: 39255

#Plant Biotechnology

Q. Which crop shows variation in plant height, yield, fertility, and days to maturity following gametophytic tissue culture?

TLS Online TPP Program

#Question id: 39256

#Plant Biotechnology

Q. Resistance to TMV and root-knot nematode in gametophytic tissue culture-derived plants has been reported in:

TLS Online TPP Program

#Question id: 39257

#Plant Biotechnology

Q. Assertion (A): The main purpose of producing asymmetric hybrids is the introgression of specific desirable genes into another species.

Reason (R): Asymmetric hybridization allows selective elimination of chromosomes from one parent while retaining specific genes.

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.