Which of the following is not an observation or inference on which natural selection is based?

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#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.