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Dihybrid Problems

Dihybrid Problems. Definition – Genetics Problems with two traits tracked at the same time Try This: Given B = brown hair, b = blond hair AND T = Tall while t = short . BbTt = ______________ phenotype Bbtt = ______________ phenotype bbTT = ______________ phenotype

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Dihybrid Problems

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  1. Dihybrid Problems • Definition –Genetics Problems with two traits tracked at the same time Try This: • Given B = brown hair, b = blond hair AND T = Tall while t = short. • BbTt = ______________ phenotype • Bbtt = ______________ phenotype • bbTT = ______________ phenotype • bbtt = ______________ phenotype Brown, Tall Brown, Short Blond, Tall Blond, Short

  2. BbTt Arrow Rule When drawing your sperm and egg for the 7 steps in this type of problem each: Sperm contains __________ genes? Egg contains __________ genes? Predict the sperm or eggs possible for a critter of BbTt. Arrow Rule: 2 2 BT, Bt, bT, bt

  3. Dihybrid gamete formation • What sex cells could be obtained from the genotypes below? • Bbtt: ___________, ___________, ___________, ___________ • bbtt: ___________, ___________, ___________, ___________ • BBTT: ___________, ___________, ___________, ___________ • BbTt: ___________, ___________, ___________, ___________ • Hint: repeated sperm or eggs can be crossed out. Bt Bt bt bt bt bt bt bt BT BT BT BT BT Bt bT bt

  4. Dihybrid:Cross a totally heterozygous brown eyed tall girl with a heterozygous brown eyed homozygous tall guy. Do together on board

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