Laws of dominance is one of the law of out of three laws of inheritance.
Three laws of inheritance is
Laws of dominance
Laws of segregation
Laws of independent assortment
During crossing of two contrasting trait, only a one trait will be appeared and others will be suppressed.
The appeared trait is dominant trait and other is ressesive trait. Though, both will be inherit, but one will be hiden and another will be appeared.
Dominance trait will suppress the ressesive trait.
In monohybrid crossing, in first generation monohybrid trait will be appeared. But, in second generation both trait will be appeared at a ratio of 3:1.
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