ed that when a pure
he first generation (F),
In one of his experiments with pea plants Mendel observed that w
tall pea plant is crossed with a pure dwarf pea plant, in the first genera
only tall plants appear.
(a) What happens to the traits of the dwarf plants in this case?
(b) When the plants of Fı generation were self-fertilised, he observed
the plants of second generation (F2), both tall plants and dwarf plante
present. Why it happened? Explain briefly.
Answers
Answer:
In the 1st generation, when Mendel cross pollinated the tall plants and short plants he got all plants to be tall. this is because the genes of the tall plants are dominant . dominant genes are genes which can express itself when occurring even in a single copy . the traits of small plants are recessive it means that they can express itself when occurring only in a double copy .
when F1 generation is fertilized , he observed 1/4th of plants resembled the parental copy of F1 generation and the rest 3/4th of them were tall .
parents : tall plants dwarf plants
genes : TT x tt ( cross pollinated )
F1 generation : Tt , Tt ( all were tall )
F2 generation : Tt ; Tt ; TT ( 3/4th tall )
tt ( 1/4th short )
the ratio of tall plants to the dwarf ones is 3 : 1
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