31. Alleles which contribute towards continuous variation are called as:
A) Effective alleles
B) Contributing alleles
C) Both (i) and (ii)
D) Non-effective alleles
32. Alleles which do not contribute towards continuous variation are called as:
A) Contributing alleles
B) Non-effective alleles
C) Non-contributing alleles
D) Both (ii) and (iii)
33. The genetic makeup of an organism is called as:
A) Phenotype
B) Character or trait
C) Genotype
D) Variation
34. The external appearance of an organism is called as:
A) Phenotype
B) Character or trait
C) Genotype
D) Variation
35. Term free and potential variability was coined by:
A) Dobzhansky (1951)
B) Schmidt (1919)
C) Waddington (1953)
D) Mather (1943)
36. As the number of genes governing a trait becomes smaller, its improvement becomes:
A) Easier
B) Difficult
C) Not possible
D) Highly difficult
37. Choose the correct statement:
A) Development of a character or trait is the product of a large number of biochemical reactions
B) Genetic variability is a prerequisite for crop improvement
C) With an advance in the segregating generations, the variability within individual plant progenies is reduced
D) All of these
38. Who confirmed that quantitative characters are governed by many genes by studying the inheritance of corolla length in Nicotiana longiflora?
A) Yule (1906)
B) East (1916)
C) Nilsson-Ehle (1908)
D) Mather (1941)
39. Who first suggested that many genes with small and similar effects could produce continuous variation?
A) Yule (1906)
B) East (1916)
C) Nilsson-Ehle (1908)
D) Mather (1941)
40. Who suggested that true quantitative genes with small and cumulative effect characters are governed by many?
A) Yule (1906)
B) East (1916)
C) Nilsson-Ehle (1908)
D) Mather (1941)
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