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Question

One plant with dominant tall height bearing purple flower crossed with another plant with recessive dwarf and white flower. 9:3:3:1 is the phenotype ratio in F2 generation.

Type 1 for true and 0 for false

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Solution

All F1 progeny are tall with purple flowers. T,t represent tall and dwarf characters respectively while P,p represent purple and white colors of flowers.

Punnet's square for F2 of this cross can be shown as :-
Gametes TP Tp tP tp
TP TTPP (a) TTPp (a)TtPP (a) TtPp (a)
Tp TTPp (a) TTpp (b) TtPp (a) Ttpp (b)
tPTtPP (a) TtPp (a) ttPP (c) ttPp (c)
tp
TtPp (a) Ttpp (b) ttPp (c) ttpp (d)
Here phenotype ratio for F2 is 9:3:3:1.
(a) Tall and purple flower - 09
(b) Tall and white flower - 03
(c) Dwarf and purple flower - 03
(d) Dwarf and white flower - 01

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