Question

29. Observe the following cross between tall plants having round seeds and dwarf plants having wrinkled
seeds the individual obtained in the Fl generation were there after self crossed.

TTRR
(tall and round)

ttrr
(dwarf and wrinkled)

TTRR X TtRr

F-1 generation self crossed
(tall and round)
TtRr X TtRr

a. What would be the phenotype of individuals obtained in the the f2 generation give their ratio

b. Why do you think all the individuals of the Fl generation were tall with round seeds​

Answer 1

Answer:

a. The ratio is 9:3:3:1

(Note that phenotype only corresponds to the physical appearance of the offspring.In this case you obtain 9 plants of tall round,3 plants of short round,3 plants of tall wrinkled and 1 plant of short wrinkled.Therefore the ratio became 9:3:3:1)

b.All plants in F1 generation were tall and round because tallness and roundness were the DOMINANT TRAITS.

(Note that only dominant traits will get expressed in F1.Dwarfness and wrinkled were the recessive traits.They do not get expressed at all in F1.)

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