Tamil Nadu (English Medium) Plus 2 Biology Science Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in

Question-1
If recombination of the gene is 50%, the linkage will be

(A) cis	(B) trans
(C) complete	(D) incomplete

Question-2
Lack of independent assortment of genes A and B in fruit fly Drosophila is due to

(A) repulsion	(B) linkage
(C) crossing over	(D) recombination

Question-3
Three crops that contribute maximum to the global food grain production are

(A) wheat, rice and maize	(B) wheat,rice and barley
(C) rice, maize and sorghum	(D) wheat, maize and sorghum

Question-4
Somaclonal variation can be obtained by

(A) hybridization	(B) tissue culture
(C) application of colchicine	(D) irradiation with gamma rays

Question-5
The genetic material in × 174 is

(A) single-stranded DNA	(B) single -stranded RNA
(C) double-strande DNA	(D) double-stranded RNA

Question-6
Linkage was detected by

(A) Miller	(B) De Vries
(C) Morgan	(D) Mendel

Question-7
Which of the following is used in genetic engineering?

(A) nuclease	(B) RNA polymerase
(C) DNA polymerase	(D) restriction endonuclease

Question-8
The lac operon is an example of

(A) arabinose operon	(B) inducible operon
(C) repressible operon	(D) overlapping genes

Question-9
Manipulation of DNA in genetic engineering became possible due to the discovery of

(A) primase	(B) transcriptase
(C) DNA ligase	(D) restriction endonuclease

Question-10
The restriction endonuclease is used for cutting

(A) m-RNA	(B) RNA fragment
(C) single-strand DNA	(D) double-stranded DNA

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Plus 2 Biology Science

Tamil Nadu (English Medium)

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