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DiHybrid Cross 2 1. Ggbb= Gray hair and Red eyes ggbb= White hair and Red eyes ggBB= White hair with Black eyes GgBb= Gray hair with Black eyes 2. Gb Gb Gb gB GgBb GgBb GgBb gB GgBb GgBb GgBb gb Ggbb Ggbb Ggbb gb Ggbb Ggbb Ggbb Phenotype: ½ gray fur and black eyes, ½ gray fur and red eyes. Gb GgBb GgBb Ggbb Ggbb 3. GB Gb gB gb GB GGBB GGBb GgBB GgBb Gb GGBb GGbb GgBb Ggbb gB GgBB GgBb ggBB ggBb gb GgBb Ggbb ggBb ggbb Phenotype: 9/16 grey fur and black eyes, 3/16 grey fur and red eyes, 3/16 white fur and black eyes, 1/16 white fur and red eyes 4. GB Gb gB GgBB GgBb gb GgBb Ggbb gB GgBB GgBb gb GgBb Ggbb Genotype: ¼ GgBB, ½ GgBb, ¼ Ggbb GB GgBB GgBb GgBB GgBb Phenotype: 12/16 grey fur and black eyes, ¼ grey fur and red eyes 5. Gb GgBb Ggbb GgBb Ggbb genotype BB Bb bb NN Nn nn 6. nnbb x NnBb phenotype barbs barbs smooth Non resistance Non resistance resistance 7. NB Nb nB nb nb NnBb Nnbb nnBb nnbb nb NnBb Nnbb nnBb nnbb nb NnBb Nnbb nnBb nnbb nb NnBb Nnbb nnBb nnbb 8. Phenotype: 4/16 nonresistant and barbs, 4/16 nonresistant and smooth, 4/16 resistant and barbs, 4/16 resistant and smooth 9. a. S – spotted skin, s – non-spotted skin, W – wooly hair, w – non-wooly hair b. Ssww x ssWw c. Sw Sw sw sw sW SsWw SsWw ssWw ssWw sw Ssww Ssww ssww ssww sW SsWw SsWw ssWw ssWw sw Ssww Ssww ssww ssww Genotype: 4/16 SsWw, 4/16 ssWw, 4/16 Ssww, 4/16 ssww Phenotype: 4/16 spotted skin and wooly hair, 4/16 non-spotted skin and wooly hair, 4/16 spotted skin and non-wooly hair, 4/16 non-spotted skin and non-wooly hair 10. a. B – black, b – chestnut, T – trotting, t – pacing b. BBtt x bbTT c. Bt Bt Bt bT BbTt BbTt BbTt bT BbTt BbTt BbTt Bt BbTt BbTt bT BbTt bT BbTt Genotype: 100% BbTt phenotype: 100% black and trotting BbTt BbTt 11. a. W – white, w – yellow, D – disk, d – sphere b. WWDD x wwdd c. WD WD wd WwDd WwDd wd WwDd WwDd wd WwDd WwDd wd WwDd WwDd Genotype: 100% WwDd BbTt BbTt BbTt BbTt WD WwDd WwDd WwDd WwDd WD WwDd WwDd WwDd WwDd phenotype: 100% white and disk 12. a. R – running, r – waltzing, B – black, b – brown b. RrBb x RRBB c. RB Rb rB RB RRBB RRBb RrBB RB RRBB RRBb RrBB RB RRBB RRBb RrBB RB RRBB RRBb RrBB Genotype: 4/16 RRBB, 4/16 RRBb, 4/16 RrBB, 4/16 RrBb rb RrBb RrBb RrBb RrBb Phenotype: 16/16 running and black 13. a. R – running, r – waltzing, B – black, b – brown b. RRBB x Rrbb c. RB RB Rb RRBb RRBb rb RrBb RrBb Rb RRBb RRBb RB RRBb RrBb RRBb RB RRBb RrBb RRBb rb RrBb Genotype: 50% RRBb 50% RrBb phenotype: 100% running and black RrBb 14. a. R – running, r – waltzing, B – black, b – brown b. rrbb x rrbb c. rb rb rb rrbb rrbb rb rrbb rrbb rb rrbb rrbb rrbb rrbb rb Genotype: 100% rrbb Phenotype: 100% waltzing and brown RrBb RrBb rb rrbb rrbb rrbb rrbb rb rrbb rrbb rrbb rrbb 15. a. R – running, r – waltzing, B – black, b – brown b. RRBb x rrbb c. RB Rb RB rb RrBb Rrbb RrBb rb RrBb Rrbb RrBb rb RrBb Rrbb RrBb rb RrBb Rrbb RrBb Genotype: 50% RrBb, 50% Rrbb phenotype: 50% running and black, 50% running and brown 16. a. R – running, r – waltzing, B – black, b – brown b. Rrbb x RrBB c. Rb Rb rb RB RRBb RRBb RrBb RB RRBb RRBb RrBb rB RrBb RrBb rrBb rB RrBb RrBb rrBb Genotype: 4/16 RRBb, 8/16 RrBb, 4/16 rrBb Phenotype: 12/16 running and black, 4/15 waltzing and black Rb Rrbb Rrbb Rrbb Rrbb rb RrBb RrBb rrBb rrBb 17. a. R – running, r – waltzing, B – black, b – brown b. RrBb x RrBb c. RB Rb rB rb RB RRBB RRBb RrBB RrBb Rb RRBb RRbb RrBb Rrbb rB RrBB RrBb rrBB rrBb rb RrBb Rrbb rrBb rrbb Genotype: 1/16 RRBB, 2/16 RRBb, 2/16 RrBB, 4/16 RrBb, 1/16 RRbb, 2/16 Rrbb, 1/16 rrBB, 2/16 rrBb, 1/16 rrbb Phenotype: 9/16 running and black, 3/16 running and brown, 3/16 waltzing and black, 1/16 waltzing and brown 18. Set up a punnett square using the following information: a. Dominate allele for tall plants = D b. Recessive allele for dwarf plants = d c. Dominate allele for purple flowers = W d. Recessive allele for white flowers = w e. Cross a homozygous dominate parent (DDWW) with a homozygous recessive parent (ddww) FOIL: DW, DW, DW, DW and dw, dw, dw, dw dw dw dw dw DW DdWw DdWw DdWw DdWw DW DdWw DdWw DdWw DdWw DW DdWw DdWw DdWw DdWw Using the Punnett square in question #1: What is the probability of producing tall plants with purple flowers? Possible genotype(s)? DW DdWw DdWw DdWw DdWw 100% will be tall and purple DdWw What is the probability of producing dwarf plants with white flowers? Possible genotype(s)? 0% What is the probability of producing tall plants with white flowers? Possible genotype(s)? 0% What is the probability of producing dwarf plants with purple flowers? Possible genotype(s)? 0% 19. Set up a punnett square using the following information: a. Dominate allele for black fur in guinea pigs = B b. Recessive allele for white fur in guinea pigs =b c. Dominate allele for rough fur in guinea pigs = R d. Recessive allele for smooth fur in guinea pigs 1. = r e. Cross a heterozygous parent (BbRr) with a heterozygous parent (BbRr) FOIL: BR, Br, bR, br BR Br bR br BR BBRR BBRr BbRR BbRr Br BBRr BBrr BbRr Bbrr bR BbRR BbRr bbRR bbRr br BbRr Bbrr bbRr bbrr Using the punnett square in question #3: What is the probability of producing guinea pigs with black, rough fur? Possible genotype(s)? 9/16 BBRR, BBRr, BbRR, BbRr, What is the probability of producing guinea pigs with black, smooth fur? Possible genotype(s)? 3/16 BBrr, Bbrr, What is the probability of producing guinea pigs with white, rough fur? Possible genotype(s)? 3/16 bbRR, bbRr What is the probability of producing guinea pigs with white, smooth fur? Possible genotype(s)? 1/16 bbrr
