The letters on the outside represent the parent's alleles. The letters inside represent the offspring's gene combinations.
The recessive phenotype means to be possessing the recessive trait. An offspring needs to possess two recessive alleles in order to have the recessive trait, otherwise the offspring will have the dominant trait.
In the punnet square, obviously 1/4 possesses two recessive alleles, thus 25% has the recessive phenotype.
Apr 14th, 2015
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