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Punnett Squares - Coggle Diagram

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        Cross the individual with the unknown genotype demonstrating the dominant trait with one that is recessive.
        
        If all the offspring of this cross display the dominant trait, then the parent in question must be homozygous dominant.
        
        If the offspring of the cross resulted in a 50/50 or 1:1 ratio of dominant phenotypes to recessive phenotypes, the parent in question must be heterozygous.
        
        In summary:
        
        100 percent dominant offspring = homozygous
        
        50 percent dominant and 50 percent recessive offspring (1 dominant:1 recessive ratio) = heterozygous