A true-breeding tall, purple-flowered pea plant (TTPP) is crossed with a true-breeding dwarf, white-flowered plant (ttpp).
(a) What is the phenotype of the $F_{1}$ generation?
(b) What is the genotype of the $F I_{1}$ generation?
(c) What four type of gametes are formed by $F_{1}$ plants?
(d) Fill in the given Punnett square to show the offspring of the $F_{2}$ generation.
(e) List the phenotype and ratios found in the $F_{2}$ generation.

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Solution

Gametes $\to$
$↓$ TP Tp tP tp
TP TTPP TTPp TtPP TtPp
Tp TTPp TTpp TtPp Ttpp
tP TtPP TtPp ttPP ttPp
tp TtPp Ttpp ttPp ttpp
(a) TTPP x ttpp
$↓$
TtPp ( all will be tall, purple flowered pea plants)

(b) Genotype: TtPp

(c) Gametes formed by F $_{1}$ plants:
TtPp * TtPp
$↓$
TP Tp tP tp (as shown in the above Punnett square)

(d) Solved above

(e) Phenotypes: 1. tall and purple
2. tall and white
3. dwarf and purple
4. dwarf and white
Phenotypic ratio: 9 : 3 : 3: 1
Genotypic ratio: 1 : 2 : 1 : 2 : 4 : 2 : 1 : 2 : 1

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Gametes $\to$ $↓$	TP	Tp	tP	tp
TP	TTPP	TTPp	TtPP	TtPp
Tp	TTPp	TTpp	TtPp	Ttpp
tP	TtPP	TtPp	ttPP	ttPp
tp	TtPp	Ttpp	ttPp	ttpp