Punnett Square - Chart that helps determine possible offspring combinations, Allele - different forms of a gene, Homozygous Recessive - genotype made up of two recessive alleles, Homozygous Dominant - genotype made up of two dominant alleles, Heterozygous - genotype of one dominant and one recessive allele, Genotype - allele combination, Phenotype - observable physical traits, Uppercase - Dominant alleles are written out in this "case", Lowercase - Recessive alleles are written out in this "case", BB - This is an example of a homozygous dominant genotype, bb - This is an example of a homozygous recessive genotype, Bb - This is an example of a heterozygous genotype, Offspring - These allele combinations are written INSIDE the Punnett square, Parents - These allele combinations are written on the OUTSIDE of the Punnett square, 25% - This percentage refers to 1/4, 50% - This percentage refers to 2/4, 75% - This percentage refers to 3/4, 100% - This percentage refers to 4/4, Dominant - This allele always overshadows other alleles, Recessive - This allele is overshadowed by other alleles,

Punnett Square Key Terms

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