A. A purine is replaced by a pyrimidine or vice-versa
B. A base-pair is replaced by another in which the orientation of purines and pyrimidines have become reversed
C. A base-pair is replaced by another in which the orientation of purines and pyrimidines have not changed
D. Either A or B
Answer: Option D
This Question Belongs to Biology GK Chapter Wise >> Gentics And Evoloution
A piece of DNA molecule that can serve as a carrier for the gene to be cloned is called as a
A. Virus
B. Vector
C. DNA junk
D. Gene factor
A haploid organism contains only one set of chromosomes, and is said to be
A. Homozygous
B. Heterozygous
C. Hemizygous
D. Holozygous
Which of the following is the correct pair?
A. Darwin - Use and disuse of organs
B. de Vries - Mutation theory
C. Lamarck - Origin of life
D. Haldane - Law of heredity
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