alleryIn a cross between two heterozygous tall pea plants (Tt × Tt), what fraction of the offspring will be pure dwarf?
AAll offspring
B1 of 2
C3 of 4
D1 of 4
Answer & Solution
Correct answer: D. 1 of 4
1. Each parent (Tt) produces gametes carrying either T or t in equal numbers.
2. Draw the Punnett square: TT, Tt, Tt, tt are the four equally likely outcomes.
3. Only the tt offspring is pure dwarf.
4. That is one out of four equally likely outcomes.
5. So one quarter of the offspring will be pure dwarf.
6. Three quarters of the offspring will be tall (TT and Tt).
_Source: syllabus Science Ch 9 'Heredity' (learncbse.in extract)_
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