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Biology Genetics Problems Name ________________________________ Date _____________ Period _____ 1. For each genotype, indicate whether it is heterozygous (HE) or homozygous (HO) AA ____ Bb ____ Cc ____ Dd ____ ee ____ FF ____ Gg ____ hh ____ 2. For each of the genotypes below, determine the phenotype. a. Purple flowers are dominant to white flowers. PP _____________ Pp _____________ pp ____________ b. Brown eyes are dominant to blue eyes. BB ______________ Bb ______________ bb _______________ c. Round seeds are dominant to wrinkled. RR ______________ Rr ______________ rr ________________ 3. For each phenotype, list the genotypes. (Remember to use the letter of the dominant trait) a. Straight hair is dominant to curly __________ straight b. Pointed heads are dominant to round heads __________ straight ________ pointed _________ curly ________ pointed _________ round 4. Set up a Punnett square for each of the crosses listed below. The trait being studied is round seeds (dominant) and wrinkled seeds (recessive) a. Rr x rr What % of the offspring will be round? ______ a. Rr x Rr What % of the offspring will be round? ______ a. RRx Rr What % of the offspring will be round? ______ 5. A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. What are the genotypes of the parents? _____ x _____ What % of the offspring will also be homozygous? _______ 6. In guinea pigs, short hair is dominant. The genotype for a heterozygous guinea pig is ____; the genotype for a purebreeding short haired guinea pig is ____; genotype for a long haired guinea pig is _____ 7. Show the cross for a pure breeding short haired guinea pig and a long haired guinea pig. What percentage of the offspring will have short hair? __________ 8. Cross two heterozygous guinea pigs. What % of the offspring will have short hair? _____ What percentage of the offspring will have long hair? _______ 9. Two short haired guinea pigs are mated several times. Out of 100 offspring, 25 of them have long hair. What are the probable genotypes of the parents? ________ x ________ Show the cross to prove it! 10. In purple people-eaters, one-horn is dominant; no horns is recessive. Use a Punnett Square to show the cross between a hybrid purple people-eater and a purple people-eater that has no horns. List the genotypes & phenotypes of possible offspring. _______________________________________________________________________ Dihybrid Cross 11. Write the definition for the term “dihybrid cross” __________________________________________________ ________________________________________________________________________________________ 12. In guinea pigs, brown fur is dominant to white fur and short fur is dominant to long fur. What are the expected genotypic and phenotypic ratios of the offspring if a heterozygous brown, heterozygous short furred guinea pig is crossed with a heterozygous, long furred guinea pig? parental genotypes _________ x __________ genotypic ratios of offspring __________________________ phenotypic ratios of offspring _________________________ 13. Below is a pedigree for an inherited heart disease. Fill in all known genotypes. What is the probability that child F would have the inherited heart disease? ____ 14. Below is a pedigree for an inherited lung disease. Fill in the genotypes of individuals labeled with letters.
