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Dihybrid Cross Notes

Dihybrid Cross Notes. 1. Determine dominant and recessive traits. Carefully read the problem. 2. Assign letters for the trait. B = black b = white H = Hairy h = no hair. 3. Determine genotype for parents . *Parents must have 4 alleles Heterozygous, black, hairless male = Bbhh

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Dihybrid Cross Notes

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  1. Dihybrid Cross Notes

  2. 1. Determine dominant and recessive traits Carefully read the problem

  3. 2. Assign letters for the trait B = black b = white H = Hairy h = no hair

  4. 3. Determine genotype for parents *Parents must have 4 alleles Heterozygous, black, hairless male = Bbhh White heterozygous hairy female = bbHh

  5. 4. Draw the punnett square with 16 boxes

  6. 5. Put parent gamete combinations on box Bbhh gametes: Bh, Bh, bh, bh bbHh gametes: bH, bh, bH, bh Bh Bh bh bh bH bh bH bh

  7. Extra tips • When determining the probability of events • If the problem states “and” then multiply the chances for each • Chance of heads and heads = ½ x ½ = ¼ or 25% • If the problem states “or” then add the chances for each • Chance of heads or tails = ½ + ½ = 1 or 100% As you work the problems write in your own extra tips

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