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Which term refers to the external, observable expression of a particular trait in an organism?
AGenotype
BPhenotype
CAllele
DLocus
Answer & Solution
Correct answer: B. Phenotype
1. The external expression of a trait, such as tall or dwarf, is called the phenotype.
2. The genetic make-up that underlies it, such as TT or Tt, is the genotype, which rules out option A.
3. So the observable expression is the phenotype, option B.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 18 Genetics "Monohybrid Cross", p.269_
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