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Question

Explain the law of segregation with suitable examples.(please provide the punnett square also).

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Solution

Mendel's law of segregation states that the alleles of an individual, separate during the formation of gametes.

Mendel crossed a true breeding tall plant (TT) and true breeding short plant (tt). This cross ( F1 generation) yielded only tall plants having a genotype of Tt. He then self-crossed the plants of F1 generation resulting in F2 generation. In the F2 generation, both tall and dwarf plants were found in the ratio of 3:1.

Parents:

True breeding tall plant - TT

True breeding small plant - tt

F1 generation - Tt

So, during the gamete formation both the alleles separate resulting in the formation of gametes; T and t.

F1 generation on self crossing will result in F2 generation.

The punnett square of the second generation is as follows:

T

t

T

TT

Tt

t

Tt

tt

Phenotypic ratio obtained was 3:1::tall:short


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