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Fork-line Method A method that uses genotypic ratios to predict the outcomes of genetic crosses.

Fork-line Method A method that uses genotypic ratios to predict the outcomes of genetic crosses. Based on the idea that, in a dihybrid, the two traits sort independently of one another * What happens with one trait is completely unrelated to what happens with the other trait.

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Fork-line Method A method that uses genotypic ratios to predict the outcomes of genetic crosses.

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  1. Fork-line Method A method that uses genotypic ratios to predict the outcomes of genetic crosses. Based on the idea that, in a dihybrid, the two traits sort independently of one another * What happens with one trait is completely unrelated to what happens with the other trait.

  2. Monohybrid Example 1 AA x Aa Allele options for 1st parent Genotypic Ratios ½ A ½ a ½ AA ½ Aa A Allele options for 2nd parent

  3. Monohybrid Example 2 aa x Aa Allele options for 1st parent Genotypic Ratios ½ A ½ a ½ Aa ½ aa a Allele options for 2nd parent

  4. Monohybrid Example 3 Aa x Aa Allele options for 1st parent Genotypic Ratios ½ A ½ a ¼ AA ¼ Aa ¼ Aa ¼ aa ½ A ½ Aa ½ A ½ a ½ a Allele options for 2nd parent

  5. Dihybrid Example 1 AABb x Aabb First, you need to do a Punnet Square for each trait in order to figure out your trait options A A B b A a b b

  6. Dihybrid Example 1 AABb x Aabb 1sttrait options Genotypic Ratios ½ Bb ½ bb ¼ AABb ¼ AAbb ¼ AaBb ¼ Aabb ½ AA ½ Bb ½ bb ½ Aa 2ndtrait options

  7. Dihybrid Example 2 AaBB x AAbb First, you need to do a Punnet Square for each trait in order to figure out your trait options A a B B A A b b

  8. Dihybrid Example 1 AABb x Aabb 1sttrait options Genotypic Ratios ½ Bb ½ bb ¼ AABb ¼ AAbb ¼ AaBb ¼ Aabb ½ AA ½ Bb ½ bb ½ Aa 2ndtrait options

  9. Dihybrid Example 3 AaBb x AaBb First, you need to do a Punnet Square for each trait in order to figure out your trait options A a B b A a B b

  10. Dihybrid Example 3 AaBB x AAbb 1sttrait options Genotypic Ratios ¼ BB ½ Bb ¼ bb 1/16 AABB 1/8 AABb 1/16 AAbb ¼ AA ¼ BB ½ Bb ¼ bb 1/8 AABB 1/4 AABb 1/8 AAbb ½ Aa 1/16 aaBB 1/8 aaBb 1/16 aabb ¼ BB ½ Bb ¼ bb ¼ aa 2ndtrait options

  11. Dihybrid Example 4 In rabbits, black fur (B) is dominant to white fur (b) and long hair (L) dominates short hair (l). What is the chance of getting a black, short-haired rabbit from a cross between a rabbit that is heterozygous for both traits and a rabbit that is white and heterozygous for long hair? B b, L l x b b, L l (first do your punnet squares) B b L l b b L l

  12. Dihybrid Example 4 In rabbits, black fur (B) is dominant to white fur (b) and long hair (L) dominates short hair (l). What is the chance of getting a black, short-haired rabbit from a cross between a rabbit that is heterozygous for both traits and a rabbit that is white and heterozygous for long hair? B b, L l x b b, L l ¼ LL ½ Ll ¼ ll 1/8 BbLL 1/4 BbLl 1/8 Bbll * black, short-haired ½ Bb ¼ LL ½ Ll ¼ ll 1/8 bbLL 1/4 bbLl 1/8 bbll ½ bb

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