MCQ on Genetics and Plant Breeding for various Agriculture Exams Part - 2

1. Mating between closely related individuals is known as
(a) Hybridization
(b) Inbreeding
(c) Heterosis
(d) Standard heterosis

2. The magnitude of heterosis is associated with
(a) Homozygosity
(b) Heterogeneous
(c) Homogeneous
(d) Heterozygosity

3. Heterobeltiosis can be computed by mean value of the following formula:
(a) F1 – F2 / F1 × 100
(b) F1 – BP / BP × 100
(c) BP – F1 / BP × 100
(d) MP – F1 / F1 × 100

4. The formula F1 – SC / SC × 100 can be used to compute which of the following?
(a) Standard heterosis
(b) Heterobeltiosis
(c) Relative heterosis
(d) Inbreeding depression

5. Inbreeding depression is very less in case of
(a) Self-pollinated crops
(b) Cross-pollinated crops
(c) Often cross-pollinated crops
(d) Both A and B

6. Who is known as the father of hybrid rice?
(a) Harlen
(b) G.W. Burton
(c) E.E. Hartwig
(d) Y.L. Ping

7. Diallel selective mating system is used for genetic improvement among which crop?
(a) Cross-pollinated
(b) Often cross-pollinated
(c) Self-pollinated
(d) Vegetatively propagated crop

8. Method used for population improvement is
(a) Pedigree
(b) Recurrent selection
(c) Bulk
(d) SSD

9. Which of the following methods is not appropriate for population improvement?
(a) Pureline selection
(b) Recurrent selection
(c) Biparental mating
(d) Disruptive selection

10. A population in which each individual plant has equal chance of mating with other individuals of that population is called
(a) Random mating population
(b) Panmictic population
(c) Mendelian population
(d) All of these

11. A fundamental law of population genetics was developed by
(a) Hardy & Fisher
(b) Weinberg & Flor
(c) Hardy & Weinberg
(d) Hardy & Mather

12. Which of the following evolutionary forces change gene frequency?
(a) Mutation, Migration, Selection and Genetic drift
(b) Mutation, Selection and Genetic drift
(c) Migration, Mutation and Genetic drift
(d) Selection, Genetic drift and Mutation

13. Repeated selection generation to generation, simultaneously intermating of selected plants to provide genetic recombination is known as
(a) Disruptive selection
(b) Recurrent selection
(c) Biparental selection
(d) Progeny selection

14. Recurrent selection is more commonly used in
(a) Autogamous species
(b) Often self-pollinated crops
(c) Allogamous species
(d) Often cross-pollinated crops

15. Which of the following is base material for recurrent selection?
(a) Open pollinated variety
(b) Pureline
(c) Self-pollinated variety
(d) Wild species

16. Which of the following is/are basic assumptions of recurrent selection?
(a) Absence of epistasis
(b) Absence of multiple alleles
(c) Absence of linkage disequilibrium
(d) All of these

17. In case of simple recurrent selection, selection is made on the basis of
(a) Phenotype
(b) Progeny
(c) Genotype
(d) Yield

18. Recurrent selection in which heterozygous tester is used is
(a) Simple recurrent selection
(b) Recurrent selection for SCA
(c) Recurrent selection for GCA
(d) Reciprocal recurrent selection

19. Recurrent selection in which homozygous tester is used is
(a) Simple recurrent selection
(b) Recurrent selection for SCA
(c) Recurrent selection for GCA
(d) Reciprocal recurrent selection

20. End product of recurrent selection is
(a) Top cross
(b) Clone
(c) Pureline
(d) Inbred

21. Among the following, which is the efficient breeding method used for breaking undesirable linkages?
(a) Pedigree method
(b) Disruptive selection
(c) Pureline selection
(d) SSD method

22. Yield prediction and reconstitution is possible in case of
(a) Hybrid variety
(b) Composite variety
(c) Synthetic variety
(d) Pureline variety

23. Synthetic and composite varieties are mostly relevant to
(a) Self-pollinated
(b) Cross-pollinated
(c) Both self- and cross-pollinated
(d) None of these

24. Base material used to produce synthetic varieties are
(a) Open pollinated variety
(b) Inbred
(c) Clones
(d) All of these

25. A variety which is produced by crossing between a number of lines in all possible combinations which combine well with each other is known as
(a) Composite variety
(b) Germplasm complexes
(c) Synthetic variety
(d) All of these