QQuestion
In which of the following crosses, will the F1 generation seed’s tall and dwarf traits appear in a 1:1 ratio?
(a) Tt x Tt
(b) TT x Tt
(c) TT x tt
(d) Tt x tt
✓Answer
(d) Tt x tt
Explanation:
When a heterozygous tall plant (Tt) is crossed with a homozygous dwarf plant (tt), the F1 progeny splits as:
| T | t | |
| t | Tt | tt |
| t | Tt | tt |
Tall seed = 2
Short seed = 2
Ratio = Tall : Short = 2 : 2 = 1 : 1
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