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Genetics Practice Problems - Simple Worksheet 1. For each genotype below, indicate whether it is Homozygous (Ho) / Dominant (D) or Recessive (R) / Heterozygous (He) / Purebred (P) / Hybrid (Hb) AA ________ ee __________ TT __________ Mm __________ Bb ________ Ff ___________ jj ___________ nn___________ 2. For each of the genotypes below determine what phenotypes would be possible. Purple flowers are dominant to Brown eyes are dominant to blue white flowers. eyes PP __________________ BB ________________ Pp __________________ Bb ________________ pp __________________ bb ________________ Round seeds are dominant to wrinkled seeds. Bobtails in cats are recessive. RR __________________ Rr __________________ rr __________________ TT _________________ Tt _________________ tt __________________ 3. For each phenotype below, list the genotypes (Use the letter of the dominant trait) Straight hair is dominant to curly. Pointed heads are dominant to round heads ____ straight _____ pointed ____ straight _____ pointed ____ curly _____ round 4. On the back of this handout, set up and complete Punnett Squares, then determine the 3 Genotype percentages and 2 Phenotype percentages for each of the crosses listed below. Round seeds are dominant to wrinkled seeds. What percentage of the offspring will be Rr x rr round? _______________ What percentage of the offspring will be RR x rr round? _______________ What percentage of the offspring will be RR x Rr round? _______________ What percentage of the offspring will be Rr x Rr round? _______________ Genetics Notes Review (Fill in the Blanks) 1. _________________________ refers to physical or visible characteristics that are studied in genetics. 2. _________________________ refers to the genetic makeup of an organism. 3. Factors that control traits are called ____________________________ 4 The different forms of a gene are called _________________________ 5. Scientists call an organism that has two different alleles for a trait _________________ or ______________. 6. Scientists call an organism that had two similar alleles for a trait _________________ or _______________. 7. To a geneticist, the notation rr means two __________________________ alleles 8. To a geneticist, the notation Rr means one ____________________ and one ____________ allele 9. __________________________is the likelihood that a particular event will occur. 10. An organism that has two identical alleles for a trait is ____________________________. 12. A heterozygous organism has two ______________________________ alleles for a trait. 13. Codominance or ________________ Dominance means the alleles are _______________________ dominant nor recessive. 14. An example of Codominance between a red carnation and white carnation would result in a _____________ carnation. 15. Any change in a gene or chromosome results in a ______________________________. 16. A mutation may be _________________ , _____________________ or _____________________ to an organism. 17. If a homozygous Red Feathered Cardinal (RR) is crossed with a homozygous Brown Feathered Cardinal (rr), what is the probability that an offspring will be a Red Feathered Cardinal? __________%