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Download Name: Date: Period: ______ Homework: Punnett Squares
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Name: ____________________________ Date: _____________________ Period: ______ HOMEWORK: PUNNETT SQUARES - DIHYBRID CROSSES 1. In flies, red eyes (R) are dominant to brown eyes (r) and brown bodies (B) are dominant to yellow bodies (b). A fly with genotype RrBb is mated with a fly with genotype rrbb. a. What percentage of offspring will genotype RRbb? ___________ b. What fraction of offspring will have red eyes and brown bodies? ____________ Show your math: 2. In pea plants, smooth peas (S) are dominant to wrinkled peas (s) and purple flowers (P) are dominant to white flowers (p). Two plants that are heterozygous for both traits (SsPp) are crossed. a. How many different genotypes will appear in the offspring? ___________ b. What percentage of the offspring will have smooth peas and purple flowers? ____________ Show your math: 3. In certain birds, yellow feathers (g) are recessive to green feathers (G) and short beaks (l) are recessive to long beaks (L). A bird with genotype (ggLl) is crossed with a bird with genotype (GgLl). a. How many different combinations of phenotypes will be in the offspring? ___________ b. What fraction of offspring will yellow feathers and long beaks? ____________ Show your math: 4. In a certain species of mammals, gray fur (G) is dominant to white fur (g) and brown eyes (B) are dominant to blue eyes (b). An animal with white fur and blue eyes is crossed with an animal that has gray fur and brown eyes (GGBb). a. What trait will appear in all of the offspring of this mating? _________________________ b. What fraction of offspring will have genotype GgBb? ____________ Show your math: 5. In cats, long hair (H) is dominant to short hair (h), and long tails (T) are dominant to short tails (t). Two cats that are heterozygous for both traits (HhTt) produce a litter of kittens. a. What percentage of offspring will be homozygous recessive for both traits (hhtt)? ___________ b. What fraction of offspring will have long hair and long tails? ____________ Show your math: 6. In plants, being tall (T) is dominant to being short (t), and smooth peas (S) are dominant to wrinkled peas (s). A tall plant with smooth peas (TtSs) is crossed with a short plant with wrinkled peas. a. What percentage of offspring will be short with smooth peas? ___________ b. What fraction of the offspring will have the genotype TtSs? ___________ c. What fraction of offspring will be tall with wrinkled peas? ____________ Show your math: 7. In certain birds, green feathers (G) are dominant to yellow feathers (g), and long beaks (L) are dominant to short beaks (l). Two birds that are heterozygous for both traits produce offspring. a. What percentage of offspring will have genotype GGLL? ___________ b. How many different combinations of genotypes will be in the offspring? ___________ c. What fraction of offspring will have yellow feathers and short beaks? ____________ Show your math: 8. In flies, red eyes (R) are dominant to brown eyes (r) and brown bodies (B) are dominant to yellow bodies (b). A fly with genotype (RRbb) is mated with a fly that is (rrBb). a. What trait will appear in all of the offspring of this mating? _________________________ b. How many different combinations of phenotypes will be in the offspring? ___________ c. What percentage of the offspring will have red eyes and yellow bodies? ___________ Show your math:
