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Punnetts Square

This resource explains how Punnett squares are used to determine the inheritance of physical traits based on allele interactions. It covers essential vocabulary including homozygous, heterozygous, genotype, and phenotype, using the example of eye shapes (big vs. small eyes). Various mating scenarios are illustrated to show genetic outcomes, such as the offspring of homozygous dominant, homozygous recessive, and heterozygous parents. This overview serves as a foundational guide for understanding basic genetic principles.

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Punnetts Square

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  1. Punnetts Square

  2. Vocabulary • Alleles: one from each parent, how they interact determines the physical characteristics of the person. EX: shape of the ear. • Homozygous: alleles are identical • Heterozygous: alleles are different • Genotype: “gene”, BB, Bb, bb • Phenotype: the physical characteristic- big eyes.

  3. 1) When 2 homozygous dominant creatures mate: B = Big eyes bb = small eyes

  4. 2) When a homozygous dominant creature mates with a homozygous recessive creature B = Big eyes bb = small eyes

  5. 3) When a homozygous dominant creature mates with a heterozygous creature B = Big eyes bb = small eyes

  6. 4) When 2 homozygous recessive creatures mate: B = Big eyes bb = small eyes

  7. 5) When a homozygous recessive creature mates with a heterozygous creature B = Big eyes bb = small eyes

  8. 6) When 2 heterozygous creatures mate B = Big eyes bb = small eyes

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