Phenotypes & Genotypes Objectives: Correctly predict genotype and phenotype Name: ____________________ Date: _________ _____ Section: Read below to review. Phenotype is the observable trait or appearance of the organism. Genotype is the genetic makeup that describes the trait. Alleles can be either dominant or recessive. P – purple flowers (dominant) p – white flowers (recessive) (Big letter is always dominant.) Dominant alleles control the phenotype if they are present, regardless of what else is present. Recessive alleles control the phenotype only if no dominant alleles are present. 1. Gene: Alleles: Flower color (P): Purple flower(dominant) (p): White flower (recessive) Genotype PP Phenotype Pp pp ____ OR ____ Purple White 2. Gene: Alleles: Snail antennae color (Y): Yellow (dominant) (y): White (recessive) Genotype YY Phenotype Yy yy ____OR ____ Yellow White 3. Gene: Alleles: Pigeon wing color (G): Dark grey (dominant) (g): Light grey(recessive) Genotype GG Phenotype Gg gg Light grey 4. Gene: Alleles: Parakeet tail length (T): Long tail (dominant) (t): Short tail (recessive) ____OR ____ Dark grey Genotype TT Phenotype Tt tt ____ OR ____ Long tail Short tail 5. Fill in the blanks with DOMINANT or RECESSIVE. If a person has two copies of the dominant gene, they show the __________________ phenotype. If a person has one copy of the dominant gene and one copy of the recessive gene, they show the _____________________ phenotype. If a person has two copies of the recessive gene, they show the ______________________ phenotype. 6. If a person shows the recessive phenotype for a trait, their genotype could be… (circle one or more) AA Aa aa 7. If a person shows the dominant phenotype for a trait, their genotype could be… (circle one or more) AA Aa aa