alleryWhat is the genotype of a heterozygous tall pea plant?
ATT
Btt
CtT only
DTt
Answer & Solution
Correct answer: D. Tt
1. A genotype shows the actual gene pair an organism carries.
2. Tallness in peas is dominant (T) and dwarfness is recessive (t).
3. A heterozygous tall plant has one dominant and one recessive allele.
4. So its genotype is Tt (one capital T and one lowercase t).
5. TT is pure tall, tt is pure dwarf, and 'tT only' is just a notation variant of Tt.
6. The clear and standard notation for heterozygous tall is Tt.
_Source: syllabus Science Ch 9 'Heredity' (learncbse.in extract)_
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