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Page 88, Dihybrid Problems #2 In rabbits, black coat color is due to a dominant gene B, brown coat color is due to a recessive gene b. Short hair is due to a dominant gene S, long hair to its recessive allele s. In a cross between 2 heterozygous black, short haired rabbits, what would be the phenotypic ratio of the offspring? 1 B – black coat S – short hair b – brown coat s – long hair Cross between 2 heterozygous black, short haired rabbits B bSs Ss BbSs x BbSs BS Bs bS bs 2 #1 Results BS Bs bS bs BS BBSS BBSs BbSS BbSs Bs BBSs BBss BbSs Bbss bS BbSS BbSs bbSS bbSs bs BbSs Bbss bbSs bbss 3 B – black; b – brown; S – short; s - long BS BS Bs bS bs BBSS BBSs BbSS BbSs Black (B), short (S) Black (B), long (s) Bs bS bs BBSs BbSS BBss BbSs BbSs Bbss BbSs Bbss bbSS bbSs bbSs bbss Brown (b), short (S) Brown (b), long (s) 9:3:3:1 4 Page 88, Dihybrid Problems #2 In horses, black color is dependent upon a dominant gene B, and chestnut upon its recessive allele b. The trotting gait is due to a dominant gene T and the pacing gait to its recessive allele t. if a homozygous black pacer is mated to a homozygous chestnut trotter, what will the genotype and phenotype of the F1 generation be? 5 B – black T - trotting Homozygous x black pacer BBtt x Bt Bt Bt Bt b – chestnut t – pacing Homozygous chestnut trotter bbTT bT bT bT bT 6 B – black; b – chestnut; T – trotting; t - pacing Bt bT BbTt bT BbTt bT BbTt bT BbTt Bt Bt Bt BbTt BbTt BbTt BbTt BbTt BbTt BbTt BbTt BbTt All offspring BbTt — Black Trotters BbTt BbTt BbTt 7 Page 88, Dihybrid Problems #3 If two F1 individuals from #3 were mated, what would be the phenotypic ratio of the offspring? BbTt BT Bt bT bt x BbTt BT Bt bT bt 8 B – black; b – chestnut; T – trotting; t - pacing BT BT BBTT Bt BBTt bT Bt bT BBTt BbTT bt BbTt 9:3:3:1 BBtt BbTt Bbtt BbTT BbTt bbTT bbTt bbTt bbtt bt BbTt Bbtt 9 Page 88, Dihybrid Problems #4 An organisms has the genotype AABb. It is crossed with an individual with the genotype Aabb. What type of gametes can be produced by these two individuals? AABb AB Ab AB Ab x Aabb Ab Ab ab ab 10