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Dihybrid (2-Trait) Inheritance

Dihybrid (2-Trait) Inheritance. 1. Mendel. Studied the inheritance of two separate traits in crossbreeding. Law of Independent Assortment. Law of independent assortment: If genes are located on separate chromosomes; they are inherited independently of each other. Gregor Mendel.

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Dihybrid (2-Trait) Inheritance

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  1. Dihybrid (2-Trait) Inheritance

  2. 1 Mendel • Studied the inheritance of two separate traits in crossbreeding

  3. Law of Independent Assortment • Law of independent assortment: If genes are located on separate chromosomes; they are inherited independently of each other

  4. Gregor Mendel • By doing other crosses, Mendel soon discovered that alleles assort independently • He saw that through crossbreeding, he always obtained a 9:3:3:1 ratio

  5. Dihybrid Sample Problem Green seeds (G) are dominant to yellow seeds (g) and smooth seeds (R) are dominant to wrinkled seeds (r). A heterozygous green and heterozygous smooth seeded plant is crossed with another heterozygous green and heterozygous smooth plant. Determine the phenotype ratio for this cross.

  6. When doing the cross, you must first determine the possible gametes from each parent (notice each gamete has 1 allele from each pair) • GgRr possible gametes are: GR, Gr, gR, gr • GgRr possible gametes are: GR, Gr, gR, gr

  7. Recall Parents: GgRr x GgRr Gametes: GR, Gr, gR, gr and GR, Gr, gR, gr • When doing a dihybrid cross, use a 4 x 4 Punnett square GR Gr gR gr Notice that the genotypes in this row repeat in the next 3 rows… GR Gr gR gr

  8. Result • Therefore, the phenotype ratio for this cross is: • 9 Green & Smooth : 3 Green & Wrinkled : 3 Yellow & Smooth : 1 Yellow & Wrinkled

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