A) mutation
B) variation
C) hybrid vigour
D) hybrid sterility
Correct Answer: C
Solution :
Heterosis term given by G.H. Shull is also known as Hybrid vigour. It is the increased vigour, growth, yield or function of a hybrid- over the parents resulting from the crossing of genetically unlike organisms. Mutation is a sudden and heritable change is the character of an organism, which does not arise due to segregation or recombination. Variation is the occurrence of differences among the individuals belonging to a single species for one or more traits. Inability to produce progeny, usually due to non functional gametes, male and female sterility.
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