Biology / Unit 5 Bio 1073 review, 2 to 3 minutes
Full Dihybrid Cross: Genotype to Phenotype
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The idea
This capstone traces a dihybrid cross from two true-breeding parental genotypes through the F1 and F2 generations to the final 9:3:3:1 phenotype ratio.
Where people slip
The 9:3:3:1 ratio is a phenotype ratio built from sixteen equally likely gamete combinations sorting into nine distinct genotypes, not four — genotype and phenotype diverge exactly where dominance masks a heterozygous locus.
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