alleryA pea plant has the genotype Tt for stem length. The state of having two unlike alleles for a trait is best described by which term?
AHomozygous
BPhenotype
CHeterozygous
DRecessive
Answer & Solution
Correct answer: C. Heterozygous
1. Alleles T and t differ from one another in the genotype Tt.
2. When the two alleles of a pair are unlike, the condition is called heterozygous.
3. When the two alleles are alike (TT or tt), the condition is homozygous, which rules out option A.
4. Therefore Tt is heterozygous, option C.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 18 Genetics "Monohybrid Cross", p.270_
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