The advantages of haploids in crop improvement include:
A. Haploids are useful for induction of mutations and mutation breeding
B. In hybridisation, the haploids combine the advantages of recombination, segregation and fixation
C. Use of haploids in the production of homozygous pureline by doubling of chromosomes reduces the total time for developing a new variety from 10 years to 5 to 6 years
D. All of the above
Answer: Option D
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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