Question

When pure long plant having a white flower is crossed with a pure dwarf plant having a red flower, the dwarf progeny in F2 generation is
A) 1/16
B) 3/16
C) 4/16
D) 9/16

Answer 1

Hint: A pure long plant with white flowers( TTWW) is crossed to pure dwarf plants with red flowers(ttww).

Complete Answer:
In the F1 generation, the formation of long plants with white flowers(TtWw) is seen. When F1 individuals are subjected to self-pollination, in the F2 generation, 9 plants are long with white flowers, 3 plants are long with red flowers, 3 plants are Dwarf with white flowers, 1 plant is dwarf with red flowers. As we know that tallness (T) is dominant over dwarfism (t) and red color (R) is dominant over white (r) flower color.
Parent Generation, P1: TTRR x ttrr F1 generation: TtRr (tall plant, red flower) P2 generation : TtRr x TtRr

Gametes	TR	Tr	tR	tr
TR	TTRR(tall plant, red flower)	TTRr(tall plant, red flower)	TtRR(tall plant, red flower)	TtRr(tall plant, red flower)
Tr	TTRr(tall plant, red flower)	TTrr(tall plant, white flower)	TtRr(tall plant, red flower)	Ttrr(tall plant, white flower)
tR	TtRR(tall plant, red flower)	TtRr(tall plant, red flower)	ttRR(dwarf plant, red flower)	ttRr(dwarf plant, red flower)
tr	TtRr(tall plant, red flower)	Ttrr(tall plant, white flower)	ttRr(dwarf plant, red flower)	ttrr(dwarf plant, white flower)

Thus, dwarf progeny in F2 generation= 4/16.
Hence the correct answer is option ‘C’.

Note: The term "F1" means the "first filial generation," or the initial cross between two genetically distinct plants. An "F2" cross is the next generation or the result of crossing two sister seedlings from the F1 cross.