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Name _____________________ MONOHYBRID CROSSES MONOHYBRID - Problems involving only one trait/letter. SAMPLE PROBLEM #1 In a species of plant, yellow color in flowers is dominant over green. If a plant that is homozygous for yellow color is crossed with a heterozygous plant, the expected results of the F1 should be? Step 1: Write the dominant/recessive traits Yellow = ________ Green = ________ Step 2: Write the genotypes of the P (Parent) generation Homozygous yellow = _____ Heterozygous = _____ Step 3: Draw a Punnett Square and place parent gametes on the square to find the possible offspring (F1) traits. Step 4: Give the genotype percent and ratio. Genotype % = ____% YY ____% Yy ____%yy Genotype ratio = ____:____:____ Step 5: Give the phenotype percent and ratio. Phenotype % = _____% yellow _____% green Phenotype ratio = _____:_____ Now work the problems on the next pages as you did Sample #1. Do all 5 steps for each problem. 1. In cockatiel bird, the gray color cockatiel is dominant over the yellow color. A homozygous gray male is mated with a homozygous gray female. What is the percent and ratio for genotype and phenotype of the offspring? Step 1 Step 3 Step 2 Step 4 Genotype ______________________ % _______________ ratio Step 5 Phenotype _____________________% ________________ratio 2. In cockatiel bird, the gray color cockatiel is dominant over the yellow color. A homozygous yellow male cockatiel is mated with a homozygous yellow female cockatiel. (Remember gray is dominant) What are the offspring? Step 1 Step 3 Step 2 Step 4 Genotype ______________________ % _______________ ratio Step 5 Phenotype _____________________% ________________ratio 3. In horses, black is dominant to chestnut. If a homozygous black male horse is mated to a heterozygous black female horse, what is the percent and ratio for genotype and phenotype of the offspring? Step 1 Step 3 Step 2 Step 4 Genotype ______________________ % _______________ ratio Step 5 Phenotype _____________________% ________________ratio 4. In domestic swine (pigs), a white belt around the body is dominant to a solid colored body. What type of offspring is possible when a heterozygous white belted male pig is mated to a female pig with a solid colored body? Step 1 Step 3 Step 2 Step 4 Genotype ______________________ % _______________ ratio Step 5 Phenotype _____________________% ________________ratio What are the chances of the pig being solid colored? 5. In man, a normal mind is dominant to a feeble mind. If a homozygous normal minded man marries a feeble-minded woman, what type of offspring is possible? Step 1 Step 3 Step 2 Step 4 Genotype ______________________ % _______________ ratio Step 5 Phenotype _____________________% ________________ratio What are the chances of the offspring being normal? 6. In fruit flies, a recessive gene causes tan eyes whereas a dominant gene causes red eyes. If a tan-eyed male were mated to a homozygous red-eyed female, what is the F1? Step 1 Step 3 Step 2 Step 4 Genotype ______________________ % _______________ ratio Step 5 Phenotype _____________________% ________________ratio What are the chances of the offspring being tan-eyed? 7. In peas, tall is dominant to short. Describe the F1 if a heterozygous tall plant is crossed with a pure short plant. What would be the results this crossing? Step 1 Step 3 Step 2 Step 4 Genotype ______________________ % _______________ ratio Step 5 Phenotype _____________________% ________________ratio What are the chances of the offspring being short? 8. If dimpled cheeks are dominant over non-dimpled cheeks, what may one expect if two hybrid dimpled individuals are crossed? Step 1 Step 3 Step 2 Step 4 Genotype ______________________ % _______________ ratio Step 5 Phenotype _____________________% ________________ratio What are the chances of the offspring having dimples? 9. If orange orangutans was dominant over albino (no color = white), what would be the outcome of a cross between a heterozygous orange male and a heterozygous female? Step 1 Step 3 Step 2 Step 4 Genotype ______________________ % _______________ ratio Step 5 Phenotype _____________________% ________________ratio What are the chances of the offspring being albino?
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