Choose the correct statement:
A) Variability is due to the genetic constitution of individuals of a population
B) Variability also arises due to the environment in which the individuals are grown
C) Variability is essential for biotic and abiotic resistance, adaptability, improvement in yield, and quality
D) All of these
The source of variability arises due to:
A) Spontaneous mutations
B) Natural outcrossing
C) Segregations and recombinations
D) All of these
Gradual loss of variability from cultivated species and their wild forms or wild relatives is called as:
A) Loss of variability
B) Genetic erosion
C) Both (i) and (ii)
D) Spontaneous mutations
Choose the correct statement:
A) Replacement of genetically variable land races by improved genetically uniform pure line or hybrid varieties causes genetic erosion
B) Improved crop management practices also play an important role in genetic erosion
C) Conservation of genetic variability can be achieved by maintaining gene pool, using heterogeneous populations, and multiline varieties
D) All of these
The observable variation present in a character in a population is called as:
A) Phenotypic variation
B) Total variability
C) Both (i) and (ii)
D) Environmental variation
The component of variation, which is due to the genotypic differences among individuals within a population, is called as:
A) Genotypic variation
B) Inherent variability
C) Genetic variability
D) All of these
Choose the correct statement:
A) Non-heritable variation which is entirely due to environmental effects is called environmental variation
B) The magnitude of phenotypic variation differs under different environmental conditions
C) Environmental variation is measured in terms of error mean variance
D) All of these
Choose the correct statement:
A) Genetic variability that is available for selection to act on deals with free genetic variability
B) Genetic variability that is not available for selection to act on deals with potential genetic variability
C) Free and potential genetic variabilities are represented by extreme phenotypes present in a population and by phenotypes clustering around the mean of the population, respectively
D) All of these
Law of ancestral inheritance was given by:
A) Sir Francis Galton
B) Wright
C) R. A. Fisher
D) Karl Pearson
The book Natural Inheritance was written by:
A) Sir Francis Galton (1888)
B) Wright (1922)
C) R. A. Fisher (1918)
D) Karl Pearson (1902)

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