Florida SC.7.L.16.2

Science7th GradeHeredity and Reproduction

The Standard

Determine the probabilities for genotype and phenotype combinations using Punnett Squares and pedigrees.

Florida Next Generation Sunshine State Standards for Science

Teacher's field guide

What Students Need to Do: Students use parent alleles to complete Punnett squares and report genotype and phenotype probabilities. They read pedigrees to infer likely genotypes and inheritance patterns.
What Mastery Looks Like: Given a monohybrid cross, a student fills every box correctly and states results as ratios, fractions, or percentages. The student uses affected and unaffected relatives to justify unknown genotypes in a pedigree.
Common Misconceptions: Students may confuse genotype letters with visible traits. They may think dominant means common or stronger. They may also expect every small group of offspring to match the predicted ratio exactly.
How to Assess It: Exit ticket: Cross Bb × bb, with B dominant, and report all genotype and phenotype percentages. Then label the genotypes of two unaffected parents and their affected child for a recessive trait.

Lesson moves

Give pairs allele cards and a four-box mat, then have them model Bb × Bb and tally predicted offspring.
Ask students to explain why two parents showing a dominant trait can have a child showing the recessive trait.
Play Pedigree Detective: teams label unknown genotypes on four family cards and earn a point for each evidence-based justification.
Have students advise a pea breeder which parent cross gives the best chance of recessive flowers, using a Punnett square.

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