alleryA sudden heritable change in the nucleotide sequence of DNA in an organism is termed:
AHybridisation
BMutation
CSelection
DHeterosis
Answer & Solution
Correct answer: B. Mutation
1. A heritable change in the DNA nucleotide sequence is defined as a mutation, and the affected organism is a mutant.
2. Hybridisation is crossing of types, selection is sorting from a population, and heterosis is hybrid vigour, none of which involve a DNA-sequence change.
3. Hence the answer is B.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit "Breeding and Biotechnology", p.297_
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