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Dihybrid Cross Notes

Dihybrid Cross Notes. Looking at 2 traits. Steps to Solve a D ihybrid Cross.

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Dihybrid Cross Notes

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  1. Dihybrid Cross Notes Looking at 2 traits

  2. Steps to Solve a Dihybrid Cross In race horses, black hair (B) and a trotting gait (G) are dominant traits. Recessive traits are chestnut hair (b) and a pacing gait (g). Determine the possible offspring from a cross between two heterozygous black trotters. • Step 1: Determine the letter for each trait. • B = black hair • b = chestnut hair • G = trotting gait • g = pacing gait

  3. Step 2: Determine the genotypes for both parents. Determine the possible offspring from a cross between two heterozygous black trotters. • BbGg X BbGg

  4. Step 3: Set up the Punnett Square Remember FOIL from Algebra (First, Outside, Inside, Last). BbGg X BbGg BG BgbGbg BG Bg bG bg

  5. Step 4: Fill in the Punnett Square Begin by filling in the B’s and then go back and fill in the G’s. BG BgbGbg BG Bg bG bg

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