Transcript File
Practice Problems Genotype vs. Phenotype Yellow (Y) vs. Green (y) Pea Plants Genotype • Homozygous dominant • Heterozygous • Homozygous recessive Phenotype Genotype vs. Phenotype Purple (P) vs White (p) Flowered Pea Plants Genotype • Homozygous dominant • Heterozygous • Homozygous recessive Phenotype Genotype vs. Phenotype Round (R) vs Wrinkled (r) Pea Plant Seed Shape Genotype • Homozygous dominant • Heterozygous • Homozygous recessive Phenotype Genotype vs. Phenotype Smooth (S) vs Wrinkled (s) Pea Plant Pod Shape Genotype • Homozygous dominant • Heterozygous • Homozygous recessive Phenotype Probability of Genotype for a Heterozygous Cross Ratio % TT T Tt T t tt t Probability of Phenotype for a Heterozygous Cross Ratio % TT T Tt T Tall t tt Short t Probability of Genotype & Phenotype for a Homozygous Cross Ratio % TT T Tt T Tall T tt Short T Spongebob & Friends • Scientists at Bikini Bottoms have been investigating the genetic makeup of the organisms in this community. • Use the following information to test your knowledge of genetics. Spongebob • Yellow body color is dominant to blue • What is Spongebob’s phenotype? – Yellow • What is Spongebob’s possible genotype? – YY or Yy Patrick • Tall head is dominant to short head. • What is Patrick’s phenotype? – Tall • What is Patrick’s possible genotype? – TT or Tt Spongebob • Spongebob Squarepants recently met SpongeSusie Roundpants at a dance. • Spongebob is heterozygous for his squareshape, but Susie is round. • What are the possible genotypes if they had children? • Draw a Punnett Square Spongebob • What are the chances of a child with a square shape? • ___ out of ___ • ___% • What are the chances of a child with a round shape? • ___ out of ___ • ___% Patrick • Patrick recently met Patti at a dance. • Both of them are heterozygous for their pink skin color which is dominant over yellow. • What are the possible genotypes if they had children? • Draw a Punnett Square Patrick • What are the chances of a child with pink skin? • ___ out of ___ • ___% • What are the chances of a child with yellow skin? • ___ out of ___ • ___% Squidward • Squidward’s family has light blue skin, which is the dominant trait for body color. • His family brags that they are a “purebred” line. • He recently married a nice girl with light green skin, which is a recessive trait. • What are the possible genotypes if they had children? • Draw a Punnett Square Squidward • What are the chances of a child with blue skin? • ___ out of ___ • ___% • What are the chances of a child with green skin? • ___ out of ___ • ___% Mr Krabbs • Mr Krabbs and his wife recently had a Lil’ Krabby, but it has not been a happy occasion. • Mrs. Krabbs has been upset since she first saw her baby who had short eyeballs. • She claims that the hospital goofed and mixed up her baby with someone else’s baby. • Mr. Krabbs is homozygous for his tall eyeballs, while Mrs. Krabbs is heterozygous. • Draw a Punnett Square to figure out if the hospital made a mistake.