Saturday, June 27, 2020

Mendel's law of dominance with example

  • Law of dominance:- Given by Mendel- "when  two pure homozygous plants taking only one pair of contrasting characters are crossed, only  one  character of a pair  expresses itself in the F1 generation and other is suppressed itself"


In this way, in F1 generation only one type of phenotype is expressed.

The character which is expressed in F1 generation is called Dominant and the character which is suppressed is called recessive.


The "law of dominance" is not universally applicable.


  • Example:-

Law of dominance can be explained by monohybrid cross. If a cross is made between pure red flowered plant and pure white flowered pea plant, all plants obtained in F1 generation are Red flowered pea plants, though these plants  contain the genes (Rr)  of both the characters. In the experiment, red colour is dominant character while white colour is a recessive character.

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