Question

What were Mendell’s experiments? Explain the F0, F1, and F2 generations. What postulates did he form from these experiments?

Answer 1

Mendel experiments-

• Mendel crossed a tall pea plant with a dwarf pea plant.

F0 (Parents) - TT X tt

	T	T
t	Tt	Tt
t	Tt	Tt

All the plants were tall.

Mendel crosses F1 progeny again.

F1 generation - Tt X Tt

	T	t
T	TT	Tt
t	Tt	tt

The phenotype ratio- 3:1

In the F2 generation, 75% of plants were tall and 25% of plants were dwarf. Ratio- 3:1

Only one copy of the dominant allele is enough to show a dominant phenotype. But two copies of the recessive allele are required for the expression of the recessive phenotype.

Law of segregation - This law states that only one copy of two gene copies transferred to a gamete at the time of gamete formation.

Law of independent segregation - This law states that allele pairs of different genes separate independently of each other.

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