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Understand genotypic ratios, how to calculate them for monohybrid, dihybrid and trihybrid crosses, and why they matter in Mendelian genetics.
Learn the difference between dominant and recessive alleles, how homozygous and heterozygous genotypes express traits in plants, animals and humans.
A guide to dihybrid crosses, including setup steps, Punnett square analysis, phenotypic ratios, and examples in peas and Drosophila.
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